What?! Why would you put actual trip plans on here?!
Okay, so for Hollywood Studios, a couple thoughts:
1.) I know you've built in a pretty good buffer between your expected arrival and your first FP+, so it may not be an issue, but having Toy Story Mania first on a travel day makes me a bit nervous. I'm thinking that, in the event you were running behind schedule, you might not be able to reschedule that one. However, something like a Tower of Terror you maybe could (or maybe could just get a short standby, if needed). Something to keep in mind, I guess.
2.) I would just get one of you a FP+ for Tower of Terror (and one for Olivia) and get the other one a FP+ for Rock 'n' Roller Coaster. You can get a rider swap for each of them and the other can ride anytime that day with it (along with Olivia again on ToT, if she wants to). That way you don't have to deal with the RnRC single rider line, which is the one I have had some bad luck with (i.e. extremely long wait).
For Animal Kingdom, I agree about using Single Rider on Everest if Olivia won't make it. That is generally very quick. If you did that, you could maybe use a FP+ for Lion King.
In the Magic Kingdom, make sure you each get a Rider Swap when going into the FP+ line at the Mine Train. I'm sure you'll want to ride it more than once each, so that will allow you each another go later. In theory, Olivia could ride it 3 times, I suppose, since she could use her own FP+ and go with the Rider Swap person each time too. Fun!
That's a bummer that Living with the Land is an Epcot tier 1. Hopefully you can get an extra FP+ at the kiosk that correlates well with your dinner ADR. For what it's worth, I had a Turtle Talk FP+ on the last day of this past trip (after Lauren and Aria left) and it was completely unnecessary. Maybe that varies, but I waited exactly the same amount of time as the walk-ins. If there's something else on there you want to do that maybe has a line (Character Spot or something, maybe?), it may be worth considering.
If you do the Mine Train rider swapping your first MK day and each ride twice, you could consider switching that FP+ for your second MK day to something else (maybe Space?). The other thing to consider is how many times Olivia wants to do things. If she would just want to do either Splash and Big Thunder once, you could split that and you get one, Judi get the other, and Olivia get whichever one she wants to do twice. Then she can ride with her FP+ and ride with each Rider Swap for both.
Plans look good! Hoping all the stuff I said makes sense...I am not used to having another family member who has FP+ and can ride things. And I guess I'm not even sure if Peter can ride any of these things? I'm used to just having two adults and a baby, so if anything doesn't sound right - sorry!
Good luck getting all your FP+!
and we actually already have the name picked out of Emma. Just about a month away from the due date and definitely starting to get excited ... especially now that my wife figured out how to fit 3 car seats across the back of my car - that has been the biggest challenge with this pregnancy 
