welcome to YT
Im so sorry that your family has decided they can no longer help you, maybe there is a friend or neighbor that can come over and walk him and feed him for you? of course you have to be able to trust this person. I know in my local paper people sometimes put out an ad for dog walkers/sitters, Craigs list also has these posts. another option would be to find a doggy daycare where he will be watched and have companionship (these places can get expensive) I think if you decide to leave him alone for a few hours he will do just fine, only thing is does he need to be walked or does he go on a wee wee pad also?