Hi and Welcome to YT! Sounds like you have your hands full with 2 little skin kids
I think it's great that you are trying to help your mom out. My best suggestion is to read all the helpful libraries and ask questions here. There is a lot that goes into being a good and reputable breeder of these little yorkies. So, it's good that you are trying to educate yourself. Remember, if you do end up breeding to have your dogs tested for all possible medical issues that can run in the yorkie breed. This will ensure you will have healthy babies that aren't going to have
preventable issues. And, I definitely suggest reading up on the YTCA website, also so you can be sure to always promote the traits expected in the breed.
We have several breeders here on the forum and I know they are a wealth of knowledge so you should ask all your questions. (There is a sub-forum on here for Breeder talk).
I totally know what you mean about falling in love with these little ones. It really only takes one look and it's all over, huh? lol Yorkies are such a unique and special breed. They truly are baby dolls