I'm with Benrahir. In Morrowind, I played both White Wolf Of Lokken Mountain (Mod) and Julan (companion mod). Both had romance aspects that were very well done. If there's something like that in Skryim, cool! If not, I'll roleplay it with characters that ask it of me.
I'm redoing the MQ (for the 50th time) with Julan and it's awesomely funny
He's also the companion with the most personality I've ever tried, maybe with the exception of Vilja (Oblivion).
I'd really love something like it in Skyrim. And, as I said, a "Son Companion" would be awesome, if the interactivity and personality are well done.
But what if the son DIES!
Bear with it. Life is hard in Skyrim, boy