Legal Question in Family Law in Massachusetts

Your question is at once incredibly brief and incredibly broad. I assume you are talking about a separation agreement. If your question is whether you may prevent the rest of the world from seeing your son, the answer is no.

A parent with visitation rights has the right to include third parties who behave appropriately in the visitation. This includes parents, siblings, aunts, uncles, girlfriends, boyfriends, etc.

I agree with the others. Unless you seek the court's involvement, the short answer is NO.