My parents have two daughters only and at this time they are healthy (m’A) and still working. However, if at some point they need care which eventually they will, both my husband and my sister’s husband have already told them and us they they are welcome to live with us. There should be no questions in our mind about this.
If you break it down to religion, a child is supposed to take care of their parent. It doesn’t say “oh you sons take care of your parents but daughters ummm, theat’s not yor problem.”