But I think he has it wrong here.
He is comparing the plight of a lesbian "social mother" with the plight of divorced dads: both are being excluded from their children's lives by birth mothers. True, but there is a big difference between these kinds of cases: the lesbian "social mother" has no biological connection with the child, while the father does. The test for paternity is straightforward. The "test" for parental rights for an unrelated adult is necessarily subject to judicial interpretation.
I'm writing a full column on it. More later.