Right off the bat I’d say the returning players have a huge advantage over the team with their family members.
Everything from challenges to how the game is played.
Just a cursory view before the start says that:
1) Setting up scenarios for them to turn on one another is what much of this will be all about.
2) Boyfriends/girlfriends/fiances are going to be the weakest bonds.
3) Husbands/wives will share the $1M no matter which one wins.