First of all, that's not true that if they're bigger they're silkies...I spoke to a vet in California, whom I also sent a picture of my yorkie too(she's 11 lbs)
she said she's definitely a yorkie...just because they're more than 7 lbs. does NOT mean, they're silkie...they used to breed yorkies bigger up to I believe close to 20 lbs. and have downsized them, but they can go back generation...If you have a picture of your baby, e-mail it to me at
stratman397@aol.com would love to see a picture...but, don't believe just because it's bigger it's silkie and not yorkie...It is possible they're from the
same litter and that another male got in with the female and bred with her and yours and your moms dog both have the same mother and different
father...I've seen that happen before...