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Tokyoite, not sure what kind of family account you were referring to. But Marriott limits annual transfer of 50,000 points to another account. With 3:1 transfer rate to SPG, you are only transferring ~17,000 JMB miles to his friend, which won't give you much redemption options.
I would advice against using any false information such as address in your Marriott profile. You can transfer Marriott points to anyone you like.