Hey _Lee_, Shmi Skywalker's kid....GREAT IDEA! Though I don't know if there's ever been a story written about her having a second baby.
Personally I really want Rey to be Luke's daughter. That way we can get Mara Jade into the movies at somepoint. Or, who knows what else Luke and Leia did besides kiss in front of Han Solo?!?!?!?! Seriously though, it's the "Rey, I AM YOUR FATHER!" that I'm looking forward to in Episode VIII. Maybe Luke will mentally snap from having that lightsaber pointed at him and whip out his ROTJ saber and lop off Rey's outstretched hand. The circle is complete.
Rey as a Kenobi has merit too though. British accent, Kenobi-esque attire, hermit lifestyle. I really like what Ben Ostrower says about it...
https://medium.com/@benostrower/rey-is-a-kenobi-362b5af09849#.fm3bmmdk4
As far as Canon goes, Disney doesn't give a $#!T about it. In my book, "Ben" is either a Kenobi or a Skywalker, NOT a Solo.
There's also the chance that since Disney made Ben a Solo, that they'll make Rey (Jaina Solo) be a Solo too as Kylo Ren's twin sister. And thus we have a defunct way of getting the Solo twins.
Back to Shmi Skywalker having a second baby, if she did, and it was Anakin's twin sister that had to be... sold off to pay the bills or something, that would set precedent for Luke & Leia and Ben & Rey as the Skywalker Family Twins Curse.
It's fun to speculate who's going to be who! Especially if Padme didn't die after all and lived out the rest of her life as a hermit (HINT! HINT!).... Obi-wan + Padme = Rey's mother or father, giving way to Obi-Wan being Rey's grandfather, who had the Anakin Skywalker lightsaber in his possession for 19 years = the reason it calls to Padme. That lightsaber is done with crazy, Dark-Side-tempted Skywalkers!!!
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5% rando .... Is that Rando Perhapsian? Lando Calrissian's half brother?