I added Picasso and Gilot's other child, Paloma, born 1949. Just send me a TL request to connect them.
It looks like Françoise Gilot was also married to Luc Simon, descendant of a long line of master glassmakers. Perhaps Laura Bozzay has something about them?
The Wikipedia page for Jacques (Luc Simon's father) is not linked to his son's. Now that I see it, there are names for Jacques's father (Paul, 1853-1917) and his grandfather (Pierre, 1813-1874). There is even a picture of a tombstone or cenotaph with the names of ancestors up to 1614. They were specialists of stained-glass window making though. Though French Wikipedia lists them as "master glassmakers", it looks like a different trade.