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Hi. My mane is Eva and I will be happy to help you.
If two parties (other than husband and wife filing a joint return) are selling one property, each party is selling its own portion. If the mother owns 30% and the son owns 70%, the mother will claim 30% of the sales proceeds and 30% of her basis and her own exclusion if qualified. The same rule will apply to the son's portion.
You will have to complete two separate certificates for each party.