It's lame and totally awkward IMHO. As reader, HONESTLY, I'm not engaged or pleased by these unrealistic human dynamics.
Please, don't get me wrong. That's just my personal opinion. So forgive me, if you feel offended.
I mean, we got:
Cable
Prestige/Rachel Summers
X-Man
Stryfe (in some ways)
They are all "children" of Scott and Jean. Having Scott and Jean interacting with (their) children who bear THE VERY SAME AGE OF THEIR PARENTS is very cringe-worthy.
It's not cool, or engaging, having stories with this weird and embarassing interaction.