I had in mind OP's situation where she was visiting and FIL said that about sitting, so I mentioned some of the customs we go along with. In my home, whether it is just us or we are living with either set of parents, no way will any such customs be followed. Not only is it cute, it makes him more attractive - both to me and the rest of the observers. Ha ha! Actually, it is older female relatives, not just elderly. But let's leave those details alone. Cute it is.