We'll be there at the same time doing the same thing, come read my PTR.
We are staying OKW July 28 - Aug 3 DH and our 3 kids. We've invited ILs to join us and have 2Bd lock-off HH area. ILs own Hilton timeshares and have elected to stay there instead. It's over by SEa World but the drive isn't bad. We've also invited my sister and she will stay with us. Everyone is on the reservation though incase they change minds since the room does sleep 9.
We've taken my sister (38) to WDW with us before in OCT. we don't know if she's coming yet but I've put her on all our dining. She walks a bit slower due to some medical things, but I think that is good, it slows us down.
We've never done Disney with ILs. They live in FL and have APs and do Disney much differently then we do. They've said they'll do it our way, but I know they aren't rope drop fans like we are. I plan to give them the plan and they can join us whenever they want and I won't fret about it.
With kids we have to do Disney when it's busy. So to cope with the heat we rope drop, get as much done before the heat and crowds and then take a break at lunch, enjoy the pool, DTD, mini-golf etc., and go back when it cools down.
Good luck to you! I want to keep up with your plans- how fun well be there at the same time!