So tell mama sandy, mama myra and that family
That when I get that grammy, they gon' be a granny

from Big Sean (Ft. Keely) – Love story Lyrics on Rap Genius

Meaning

As soon as he wins a Grammy, he’ll be ready to settle down and start a family. Have some children, and allow the girl’s family to become granny’s. In the meantime, he has work to do so that that can happen.

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