Changing a buyer’s name after signing a contract requires a

Changing a buyer’s name after signing a contract requires a written addendum signed by all parties, as the original contract is legally binding

. While the sale is cash, the seller should confirm that the son (new buyer) is qualified, check for assignment restrictions, and ensure the change doesn't trigger fraud concerns, such as hiding assets. 

Avvo +2

Key concerns and steps for the seller include:

• Legal Process: You cannot unilaterally change the buyer; it requires a formal amendment or assignment, say experts on Avvo and JustAnswer users.
• Contractual Rights: Check if the contract allows assignment to another party. If not, you have the right to refuse, according to JustAnswer users.
• Fraud/Liability: The request could potentially be a "proxy purchase" used to hide assets, which can carry legal risks for all parties involved, note Quora contributors.
• Recommendation: Consult with your attorney to ensure the amendment is valid, advise attorneys on Avvo. 
  Avvo +3

If you agree to the change, a simple addendum drafted by an attorney is recommended to fix compliance issues, say professionals at Jackson Lawn & Co.. 

Jackson Law