iTunes Authorize Problem!

Ok, so for no reason I press deauthorize this computer because I am messing around and then I re authorize this computer just because I want to fix everything, and then I press play for Apple Music because I have icloud family sharing with my dad so my music downloaded and the music he has downloaded on his Admin account is still on, but only now nothing on Apple music that I downloaded freely or that I listen to will play and I keep entering my password to authorize this computer to play but it is not working. But at least my iPad still plays just not my iMac. Which is an iMac mini. My iPhone 4 still plays well my iPad which is an iPad mini plays well too. My iPod still works although it dosent sync like everything else I last synced it when it was working. Also, so my mother who is gone we have a nother problem, and we have some of her music on there but we dont know what her authoriziations password is still, and even if we tried to fix all of that her email which it is associated to is also gone, and if it was still up we wouldnt know what the password to it is. Also, with my account even when the computer was working there was one song that still didnt play even if I enterd my password to authorize the computer to play, but do I want to enter my password for every song on Apple Music or can I get it fixed?(ALSO SORRY ABOUT THE TYPOS>)