My oldest grandson (who is 12 now) called me Mom because my daughter and him lived with me until he was 2 and he heard her calling me mom. Then when his brother (who is now 8) came along and started talking he called me mamaw so now I am mamaw. The oldest calls his daddy's mom "nanny" and the youngest calls his daddy's mom "grammy". My husband is papaw and the other granddad is "poppy" and one is "papaw cc". The kids usually figure out what they want to call you in their own way.