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Good evening. The seller must be on drugs! The seller has absolutely no legal grounds to claim any gain you may make on the sale of the home. Just as the seller would not be obligated to pay you if you suffered a loss, you have no legal obligation to give him any portion of the upside. You own the house and you have the risk of loss and the benefit of any gain. Although you can never prevent someone from filing a suit, he has no chance of prevailing and should he be stupid enough to file the suit, you should file a counter suit for him filing a frivolous suit against you. Any agreement relating to real estate
are, under the statute of frauds, required to be in writing. If there is no signed agreement where you agree to share any gain, he has no chance of prevailing.
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