Awww they are so cute. I have a 8 lb yorkie that came from a 5 lb momma and a smaller father. He is my little steroid boy and I love him. Living on a horse farm I am glad he is a decent size cause he can get into a lot of trouble

at 12 weeks he weighed about 3 lbs. Your boys are adorable and I am sure they are purebred just a bit bigger
Btw, i love your indoor and am terribly jealous because I dont have one