ya that is interesting. I don’t think anyone brought up morality, grandparents, or kids choice of faith up in that thread, over there the consensus was that bi-racial kids are hot 
we as muslims are far more critical and intolerant of our own differences within, that’s just sad.
in the couple I have known personally, there is actually a lot of open discussion and pondering on these issues, much more than in an average households. not everything is followed blindly but read upon and discussed for the sake of making things clear to kids, i like that.