Top Definition
When grandparents take time off of work for a new grandbaby. This could be for the visiting the new parents, babysitting the older child(ren) while new baby is being born, helping the parents with the new baby......

There's maternity leave, paternity leave and now we have graternity leave.
Dear Boss ~ I will be taking 3 days graternity leave to help with the new grandbaby.
by LNG November 09, 2011
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