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I'm sorry to hear this.
What you can do is send your son a letter telling him that you require that the house be sold. You can give him a deadline for agreeing to list the house. Then you can tell him that if he fails to agree you will simply have no choice but will need to retain a lawyer and will be seeking a court order for the sale of the home. You can tell him that if you are required to do that you will also then be seeking an order for your legal costs.
Hopefully, if you send him this letter and he takes it to a lawyer his lawyer will make him see that there is no point in going to court because the court will not require that you continue to own this home.