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In an ideal world, you should wait for them to obtain Probate and then go ahead and complete on both the house and garage. However, I appreciate your Buyers may not be willing to wait/I don't know how much of a hassle it would be for you to complete your Sale and then move into temporary accomodation until such time as your Sellers are ready.
If the above is practical, the only danger you face with the Sellers Solicitor's proposal is if there is an issue or delay in them obtaining Probate. Although Contracts will already have exchanged and therefore the Sellers are under a legal duty to complete three months down th eline, this will only be possible if Probate has been granted.
There is no reason why there should be a problem in them obtaining Probate, and I would not have thought the Solicitor would have made the proposal if he was not confident in obtaining Probate within the due time. However, if for whatever reason Probate is not obtained, the usual scenario would be for the parties just to wait the added time until it has been granted.
If for some very unusual reason Probate was never grnated or was taking over say 5 months, your only option, other than waiting, would be to rescind the Contract, meaning you pull out of the purchase of the garage. This would of course leave you in th eposition of already having completed the purchase of the house, and having a property without a garage and possible driveway. As I have said, it would be most unusual for this scenario to arise, but I always have to look on the bleak side!
I hope this assists and sets out the legal position.
Please let me know if you require any further clarification.