I'm not going to allow my cousins to grow up together.
Why don't you want them to grow up together?
We run a philanthropic business and we believe a boy and a girl shouldn't grow up together.
They are family, they shouldn't be forcibly separated. Allow them to grow up together as a family.
Family is not a big deal to live apart anyways. We believe in family separation as there is a high risk of cousins growing up and marrying each other. We want to maintain our bloodline and that is a main family goal.
I understand your perspective, but I believe it's quite overblown to think these kinds of relationships come around easily. It would be more healthy and less harmful to just let everyone grow up together as a regular family and not have to separate everyone.