This page contains information regarding Star Trek: Picard, and thus may contain spoilers.
Maurice Picard was a Human male, a native of La Barre, France on Earth. He was the husband of Yvette Picard, the father of Robert and Jean-Luc Picard, father-in-law of Marie Picard, and the paternal grandfather of René Picard. He continued the family business of winemaking under the Chateau Picard label and placed importance on keeping the family estate in the same state without making changes to it. (TNG: "Family", "Conundrum")
Maurice Picard was a very traditional man who did not believe in technology. He feared the loss of values and had frequent discussions with Yvette about whether or not to get a replicator. (TNG: "Family")
Maurice and his wife Yvette often fought; this became a catalyst for their son, Jean-Luc, to become a stargazer. (PIC: "The Star Gazer") Yvette suffered from psychotic breaks, to which Maurice implored Yvette to seek help, but Yvette refused, and Maurice came to accept that there was nothing he could do. Maurice would lock Yvette away whenever she had a psychotic episode. One such episode resulted in her attempting to take Jean-Luc away from Maurice through the underground tunnels of Château Picard, where she left him after his foot became trapped in a rotting floorboard. Maurice rescued Jean-Luc and locked Yvette away inside her bedroom. Eventually, Jean-Luc realized that his father was not being abusive or cruel, but was genuinely trying to help. (PIC: "Monsters")
Maurice opposed Jean-Luc's decision to join Starfleet, wanting him to remain home and tend to the family vineyards. The two grew estranged, and Maurice died before the two could reconcile, something which Jean-Luc regretted his entire life. (TNG: "Family", "Bloodlines")
While his sons were young boys, Maurice's father, as Jean-Luc described, deteriorated "from a powerful, intelligent figure to a frail wisp of a man, who could barely make his own way home." (TNG: "Night Terrors")
After Jean-Luc slipped into a coma following a hit-and-run attack by Adam Soong, he had visions of a Starfleet psychological evaluation in which the psychiatrist took the form of Maurice as Jean-Luc remembered him when he was a boy. During a visualisation of a story Jean-Luc was telling to the psychiatrist, with help from Tallinn, Jean-Luc realised that the psychiatrist was Maurice, who proceeded to impart the truth of Yvette's psychosis to Jean-Luc. Jean-Luc admitted to Maurice that he never really knew him. (PIC: "Monsters")
The name Maurice was first mentioned in "Chain of Command, Part I". According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 145), the name was chosen by Star Trek writer-producer Ronald D. Moore.
In the first draft script of "The Battle", Jean-Luc Picard recalled, "My father used to say, 'Nature is the best medicine for a troubled mind.'" However, later in the same scripted scene, he considered that his father may have been incorrect, concluding, "The best medicine for a troubled mind is a good woman."