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If she is listed as a joint tenant of the house on the deed, then legally she is entitled to 1/2 of the proceeds when the house sells, unless you had a written contract
to the contrary. HOWEVER, that is not the end of the story either, since along with her right to 1/2 of the proceeds, she is also liable for contribution for her 1/2 share of all costs and expenses associated with the house, which includes her 1/2 share of the mortgage payments which you would offset from her 1/2 share of the proceeds from the house.
If she is not on the deed, then she is entitled only to a return of her $25,000 contribution for the house.
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