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Jacques de Pichon Longueville was the first president of the Bordeaux parliament. He died in 1731. He married Therese de Mazure de Rauzan sometime between 1686-1689. They had a son, also named Jacques, and he had a son, Jean Pierre de Pichon (Longueville name was dropped)
Le Baron Joseph de Pichon Longueville was born in France in 1755. He (wife unknown) had 5 children - 2 boys - Raoul (born about 1781, died about 1860) married Felicite Lalande in 1891: and Louis (died in 1835) and 3 daughters: Sophie, Marie-Laure (in 1818, married Comte Louis de Lalande) and Gabrielle (married to the Comte de Lavare).
I don't know what the connection is between these 2 Bordeaux families, or with your ancestors, but at least it's a place to start.