Yvette Picard was the mother of Captain Jean Luc Picard. She died when Picard was younger, but he saw he again when the Enterprise-D was flung into a region of the universe where thoughts could become real. [1]
Yvette for a long time had suffered from mental illness with periods of darkness, during which her husband Maurice would lock her in a room in order to protect her and their young son, Jean-Luc. [2]