I have never, and would never get in between my sub and her family. In fact, I do not control who my sub chooses to have as her girlfriends. Yet, I’ve seen it with other couples. And it often ends badly. I knew a D/s couple where the Dom got in a big argument with his sub’s family. Because of it, he forbid her from associating with her sister and other family members. (This couple was married.) For 10 years, his (unfortunate) sub did not see or speak to her sister. Then, for unrelated reasons, the couple divorced. The sub reunited with her family, and once again became best friends with her sister. To this day, one of her biggest regrets in life is that she missed the birth of her sister’s kids.
My point is this: in my opinion, that Dom abused his power as a Dominant. To my view, he was selfish. I would never interfere with my sub’s family in such a manner. I would keep the peace for my submissive’s sake. If your Dom is wedging his way in between you and your family (or your friends), just be careful.
More often than not, it’s a bad sign.