Who is their grandpa?

乘著还热乎, 赶紧记下来
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Daughter:  Mommy, if my kids have kids, am I a grandma? 
Mom: Yes.

Daughter:: Then who is their grandpa?
Mom:: @#$%^&......your hu*****and.

Daughter: My hu*****and??? OMG, I am just 7 years old.
Mom: :@_@.