What are you blabbering about. There’s nothing remotely racist about speculating whether two people (one white, one also as good as white but convinced in their head that they are “of colour”) might have a dark skinned baby or a light skinned baby. It matters not but in no way is it any different to wondering if they’re going to have a big nose, fat lips or blue eyes. Any specifically racist context is the important aspect here and there has been none. Show me some proof where someone has asked “so you think it’ll come out as a big dirty black ape” and then you can have your point. If not then this is a complete non-issue.