Amy, that's awful. I really don't understand how it is that the Pearl books inspire others to buy box-fuls of them to give away to everyone. And for a family member to do that...it seems so insensitive! I'm sure he means well.
I think you could just say, "you know, everyone has their own ways of doing things, we're very happy with our marriage and our family." If they don't get the message you could add, "and we're familiar with the Pearls, I guess you could say we're just not as impressed by their ideas as some people are."
And then change the subject--quick!
Good to see you here!!