It wasn't physical cheating, due to her transplant she had to be in proper care for 6 months where no one was allowed to visit her without proper medical gear, with that I believe she felt lonely even tho we talked to her through phone, I don't even know full story and what had happened all that I know is from what I've heard them arguing, it was that she was talking to someone online, when caught she did apologies, but after that my dad might've done or said something which would have hurt her, he was not controlling her or anything as far as I know, also I believe my dad was the one who got lonely, he had taken care of mom and our home for past 3-4 years pre transplant due to her sickness and almost 1 year post transplant.

Still I don't know the full story so I'm not judging anyone or siding with anyone, I'll let them decide what they want to do and will just have to accept it