Sorry you are having problems in getting things worked out. Hopefully it really is just a matter of family problems taking precedence over the puppies right now. That being said, just because a breeder is a YT member doesn't automatically give them a seal of approval. They need to be checked out as thoroughly as anyone else. It's unfortunate, but there have been some who use YT just as a sales platform.
I hope things work out in the best interest of both you and your new pup.