Did it ever occur to you that maybe she can't have any more kids? Or maybe that he can't? Maybe they don't want any more children.
What I find strange is that you're being so judgmental of a marriage and relationship that you aren't involved in, nor do you know the people in the aforementioned relationship. Very rude to assume such a thing, and so very inappropriate.
It is strange that after seven years of marriage, Kate Beckinsale still hasn’t had any children with Len Wiseman while he has selflessly helped raise her daughter for all this time.