Originally Posted by
Tokyoite
OP asked an pinion, so its ok to give an opinion about how best to handle the situation. If OP is so worried about the parents, he should have offered/planned to put them in the higher cabin!
The OP didn't ask for your opinion on booking his/her parents in J. If you have something to contribute to the discussion about the ability to visit someone in J when you're seated in F, then go for it. But to judge the OP for booking them in J, while making a few assumptions along the way, is totally unnecessary.