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Top definition
Grandsister/Grandbrother
When your son/
daughter
has
a baby
with
your mom
/dad, said baby becomes the your grand-sister/grand-brother.
Today
I'm
taking
my Grandsister/Grandbrother to the
park
.
by
Nullivoid
December 21, 2020
Get a
Grandsister/Grandbrother
mug for your cousin Vivek.