Yvette Gessard-Picard was a Human woman who lived in La Barre, France during the 24th century. She was the wife of Maurice Picard, the mother of Robert and Jean-Luc Picard, and the paternal grandmother of René Picard. Yvette was deceased by 2364. Jean-Luc affectionately referred to her as "Maman".
Yvette used to sing "come out, come out wherever you are" to Jean-Luc when he was a young child. (Star Trek: Insurrection)
While in a distant section of the universe where thoughts become reality, Jean-Luc Picard experienced a brief vision of his mother. (TNG: "Where No One Has Gone Before")
As a child, Captain Picard took piano lessons; though he seemed apathetic to them, in later life he regretted giving them up, as they pleased his mother. (TNG: "The Perfect Mate")
Background information Edit
Yvette was played by Herta Ware. Her name was mentioned for the first time in TNG: "Chain of Command, Part I".
She was named in homage to actress Yvette Mimieux, who starred in the 1960 film The Time Machine. (Star Trek Encyclopedia 3rd ed., p. 361)
Yvette spoke English with a French accent, while Captain Picard, his father and brother spoke English with typically English accents.
A picture of Yvette was included on a page of the Picard family album that did not make it on screen.