charity

Q: I have a Muslim friend and he shared something with me secretly but I couldnt answer... he said that once he stole a telephone from someone, and he is still using that, but he cant find the owner to return it. I told him to sell the phone and give the money in charity.. but I am not a scholar so I am not sure what he should do?

Q: I am a fairly wealthy person and don't give much to my siblings' children because they are in my will. However I give lots of charity/sadaqah to other organizations. Is my sadaqah or charity valid if my sibling divorced his wife and left her and his kids, an​d they are not well off and struggle every other day?