Ahle bait

Re: Ahle bait

okay before this goes any further could someone please educate me why there is a dispute between biological and step daughters of the Prophet(pbuh) ?
I mean is this really relevant in some way?
both shias and sunnis give your views
if we accept the sunni argument that there were 4 biological daughters or the shia one that there was only one what difference is it going to make? apart from historical accuracy offcourse