I don't have Yorkie sibs (wish I did
), but I have a brother and sister Biewer duo, they are half sibs (same dam) and about 1.5 years apart.
They are joined together at the hip, if you didn't know them and saw them out somewhere, you would swear someone superglued them together, lol! I LOVE how they interact with each other, they act a lot alike, very similar personalities and love each other tremendously. I would recommend getting the opposite sex, jmo