At first I was going to argue with you, but you're right; we do have a lot left undecided! It's more I've decided how things will work well but am only 2/3rds sure since two of our group have never been before. I do know one of them is highly interested in Frontierland and Animal Kingdom while the other wants to see Disney Springs and enjoys shopping. It's something! I hope your daughter
will be able to join you. Is there a semester break in there or just for the long weekend?
(Tentative) Welcome to the crew! For what it's worth, changing dates so someone can be there
on their actual birthday is certainly a good enough reason in my book

We drive or fly from up on Lake Erie so the weather is a concern for us, too. What you have in mind for leaving a night earlier or making your stop further north than expected on Saturday is a good plan. We employed that trick last trip (heading 2 hours to the airport the night prior to avoid driving in the dark during a bad snowstorm) and, despite hitting the early bits of the storm on the way down, found that doing so was well worth the extra money for our safety! Ride rehabs --- maybe Splash or Kali River Rapids, and definitely one of the water parks, but the weather is just nice enough that you really aren't hankering to walk around wet for an hour anyway. Lastly, what do you have to look forward to if you vacation so early in the year??? No idea, I don't know your family well enough. But how about cutting your winter short with a week of Florida sunshine and coming back to only a week or two more of winter before Spring arrives?
Whichever time of year you go, I hope your family has loads of fun! Until then, lets get this list of "Get Wifey On Board with February" started.....
Reason 1 -- Winter cut short
Reason 2 -- awesome weather (with less chance of daily rain than in September)
Reason 3 -- (someone jump in)