Great pics!Since they're carrying the phone, and no one is wearing a necklace, then I'd guess that the phone is the "appetizer" (that arrives with the treemail) before the challenge, to give them incentive to do well. (that would also explain why Rob is holding it and not Jeff - it's at camp, and Rob is the leader)
I'd guess that the family visit is this week. And I'd go further to say that Andrea probably wins the actual family-visit (either as a tag-along from the actual winner, or the actual winner herself) based on the family-visit spoiler.
(which, itself, could be only that "Andrea's family member went there, but didn't get to see her, because she didn't win")
Because, really... how can Grant NOT win that challenge? He's stronger upper-body-wise, can carry more planks at once (if needed/allowed), he's got the leg muscles, and he's probably run the stairs at a stadium 100x...
Andrea has to go home this week if she doesn't win immunity.