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After the parents say goodbye to their son, Patrick says Let's have another, and SpongeBob makes a shocked face as the episode ends.  Rock-a-Bye Bivalve  is a SpongeBob SquarePants episode from season three. In this episode, SpongeBob and Patrick care for a baby scallop.
So I been watching a lot of SpongeBob in the last little while (my kids love it) and I found out what the Krabby Pattie secret formula is. Mr. Krabs has a whale daughter. But her mother is never shown (or referenced). Mr Krabs makes reference to driving a taxi and being in the Navy before opening the Krusty Krab. My theory is that the Krabby Pattie is in fact Pearls mother, and his wife. There is never any reference to her within the show.