Woman Says Her Sister Expected a Birthday Vacation Subsidy Because She Has Kids

A woman planning her milestone birthday trip said her sister became upset when she realized she would be expected to pay for her own child’s share of the vacation rental.

The 29-year-old woman shared the situation on Reddit, explaining that she would be turning 30 the following year. In her family, milestone birthdays are treated differently from regular ones. The family takes a vacation every year, but when someone turns 30, 40, or 50, that person gets to choose the destination and the trip becomes part of the celebration.

With her 30th birthday coming up, the poster started looking at Airbnb options in a few East Coast states. She said she tried to be thoughtful about the entire group, which included 12 people. That number included adults as well as three children: her niece and her father’s two younger kids, all between ages 3 and 8.

Because children would be coming, the poster searched for houses that had kid-friendly features. She found places with game rooms, pools, backyards, movie theater rooms, and plenty of space for the kids to play. She also said the houses were on the cheaper side for the size of the group, coming out to about $450 per person for four nights.

Then she mentioned the cost to her sister.

The poster told her sister the amount and said she would need to pay for her daughter too. That is when the conversation turned tense.

According to the poster, her sister became upset because on previous family vacations, the cost had only been split among the adults. Children had not been counted in the lodging breakdown. Her sister argued that the poster was being unfair because the kids were small, did not earn money, and did not need their own beds. She said they could sleep on air mattresses instead.

The poster did not agree.

From her view, the children were still part of the group using the house. They would sleep there, eat there, use the bathrooms, enjoy the pool, play in the game room, watch movies, and take up space just like everyone else. The poster had even picked houses with amenities partly because of the kids. So it bothered her that she was now being asked to help pay for those same amenities.

Her sister accused her of “nickel and diming” her and their dad over the children’s costs. That bothered the poster too, especially because she said she does not have a good relationship with her father and did not understand why she should be expected to pay for his children.

The woman shared the situation in a Reddit post titled “AITA for telling my sister I won’t be helping pay for her daughter’s vacation expenses”: https://www.reddit.com/r/AITAH/comments/1krl4nm/aita_for_telling_my_sister_i_wont_be_helping_pay/

The poster said she is single, does not have children, and does not plan to have any. She did not understand why that meant she should pay more so other people’s children could vacation for free. She also worried that if she gave in this year, it would become the expectation going forward. Every future trip would likely involve the same assumption: adults without kids help cover the cost of kids who are not theirs.

In the comments, the poster gave more detail about the math. The house she was considering cost about $5,500 for four nights, including fees and taxes. Divided by 12 people, the total came to about $450 each. Her sister asked why she divided the cost by 12 instead of nine, because there were nine adults. If the children were excluded from the count, the adults would pay more.

For the poster, that meant she would personally pay about $150 extra toward children who were not hers and were not required to attend.

She also said this was not the first time the issue had come up. In the past, vacation costs were split by adults only. But the previous year, her dad joined the trip with his younger kids, and she had raised concerns then because she did not want to pay for his children. She said she and her father were not close, and he had not paid anything for her in years.

Her child-free siblings agreed with her in principle, but they also wanted to help her sister at the time because the sister was in a doctorate program and had no income. Since the trip was shorter and the extra cost was only about $75, the poster let it go.

This year felt different. The cost was higher, her sister had since graduated, and the poster said she already pays for other things for her sister, including streaming services, coffee when she is in town, and gifts for her niece. She said her sister does not really pick up expenses for her in return, and she was tired of always paying.

That detail turned the vacation argument into something more emotional than a spreadsheet.

The poster had tried to make the trip good for everyone, including the children. But once the cost came up, she felt like the adults with kids expected the adults without kids to quietly absorb part of the bill. Her sister saw the children as too young to count. The poster saw them as people using the house and benefiting from the amenities.

There was also a fairness issue around the birthday itself. This trip was supposed to celebrate the poster’s 30th birthday, yet she was being asked to spend more money so other people’s children could come along. She had already compromised by choosing kid-friendly properties. Now she was being asked to subsidize the children too.

The conflict left her wondering if she was being too rigid or if she was finally pushing back on an old family pattern.

Commenters were somewhat divided on the best way to split the rental, but many said the poster was not wrong for refusing to pay extra for children who were not hers.

A lot of commenters said parents are responsible for the costs of their own children. If the kids are attending the vacation, using the house, sleeping there, and enjoying the amenities, many felt their parent should cover their share or at least contribute more than a single adult without children.

Several people pointed out that short-term rentals often have occupancy limits, and children still count toward the number of guests. Commenters warned that bringing air mattresses does not necessarily solve the issue, because rentals may only allow a certain number of people in the property regardless of where they sleep.

Others suggested splitting the cost by room instead of by person. That would make the price feel more connected to sleeping arrangements. But the poster later added that the top-choice house had six rooms and six beds, meaning everyone would be sharing anyway. That made the per-room solution less simple.

Some commenters said if the kids were not going to be counted in the cost, then the poster should stop choosing houses with kid-centered extras. No game room, no pool, no movie room, no big backyard. If parents wanted those features for their children, commenters said, they should be willing to help pay for them.

A few people saw the sister’s point. They argued that children often share rooms with parents, do not earn money, and may not increase the lodging cost the same way another adult would. To them, a strict per-person split could make the trip much more expensive for families.

But even among those who saw room for compromise, many agreed the sister should not expect the poster to automatically cover the difference.

The strongest advice was for the family to decide on a clear cost-splitting rule before booking anything. If the rule is per person, parents pay for their children. If the rule is per room, everyone agrees before choosing the house. What commenters did not support was changing the math only after one person had already done the planning and found a place that catered to everyone else’s kids.

By the end of the discussion, the poster’s frustration came down to one simple point: choosing not to have children did not mean her vacation money belonged to the people who did.