DEAR AMY: Two years ago, my good friends who lived across the street moved away. The following summer, I invited the new family (“Family A”) along with three other neighboring families over for a cookout. Everything went well. It was a fun evening. One of the other families that I invited (“Family B”) was also new. A and B live across the street from me, next door to each other. What I don’t understand is why neither of these new neighbors has ever invited me/my husband over to their houses. Not even for a cup of coffee. When Family B had a baby, I stopped by and dropped off a card and a gift….