I think they're arguing somewhere that Alexis is over 35 and Sam is supposed to be, what, in her twenties? If you squint hard it works even if the actors are only maybe ten years apart.

And seriously, diverse gene pool! Even though Courtney's child will be Morgan's cousin. Really, they need Elizabeth and Lucky to breed, as well as, say, Patrick. Those two new children should be a nice seed for the next generation. You know, in six years.