Congrats on what appears to be a good outcome.
It seems all the bases have been covered as best as can be with the exception of holding some of the 'renter' or seller money.
What holds up in courts depends on the skill of the attorneys involved and the pockets funding them.
Try not to drive yourself nuts worrying about what might happen. Consider offering the 'renter' an incentive for leaving the place clean or early out, that could offset some of their moving costs. This may open a communication channel for you to monitor their relocation progress.
It's time for you to start packing the seldom used stuff..
Best of success to you.
1. The "renters" have agreed to leave by Dec 17th, it will be a signed document
2. The sellers agreed to pay for any eviction costs necessary if the "renters" refuse to leave, this is on the addendum
3. The sellers agreed to pay for any damages done by the "renters" if necessary
Do you think the addendum will hold up in court?
While it's too late now you've just learned how critical it can be to not deal directly with a listing agent but to have your own buyer broker.
Good Luck, I hope all turns out OK.
Unless you get the tenants to move before your close of escrow, you may face eviction proceedings to get the tenants out of the house. As the legal owner, you have to right to pursue those legal actions, but it will cost some money. Otherwise, there's not much you can do, given the tenant rights protected by state law. If you're not comfortable, you can always find a way to back out of the deal. You don't have to put good money after bad.