My name when Andrew's 6 yrs. old

Andrew told me yesterday that when he turns 6 he will stop calling me "Mom" and start calling me "Mother." In joking I asked him what will he call me when he's 7? He thought about this, then repled that he'll call me "Mother" for a few years first, from 7-11. So I asked him again, what will he call me when he's 12? I stumped him, he had no response. HeHe