My Mother the Gossip Gal

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Advice ladies?

We are waiting to announce, but can't decide when to tell my parents as my Mother is a Gossip Gal. She announced my sister's pregnancy the day she found out after being told they were waiting to tell others.

Would it be bad if I tell my parents very last and then announce to everyone else the same day? I just want it to be our news, not her's. You know?