Mind you it is a soap .....
indeed. it doesn't need to be plausible just dramatic. and pretty much they always manage to crowbar a DNA test/blood transfusion in some how.
although on the subject of access and surrogacy, Izzy has no automatic rights, Gary does.
and whilst it is despicable to use children as a weapon...where have you ever seen a soap where they didn't. they may as well just stop calling them kids and start calling them levers/plot devices. 'I'm sorry you lost your rights to see my lever when you kissed the surrogate or is she mother of my plot device' 'but it is my lever too, Izzehh!!'