Giving fidyah on behalf of one's deceased mother

Q: My mother passed away a couple of months aga. She did not fast for many years because she was disabled from 20 years and also because of negligence. My question is, does fidyah have to be given for the missed fasts of the deceased, even though the years she did not fast is unknown.

My second question is what is the amount of fidyah to be paid for not keeping one fast.

Bunk beds

Q: I would like to arrange triple bunks bed for my boys. Is this allowed? As I have heard you are not allowed to sleep on top of each other or you shouldn't sleep above each other. Please can you clarify this.