Clancy Bouvier

Clancy Bouvier was the husband of Jacqueline Bouvier, the father of Patty, Selma, and Marge Bouvier and the maternal grandfather of Ling Bouvier and Maggie, Lisa, Hugo (non-canon), and Bart. He is of French origin.

Biography
Like Patty and Selma, he was a chain-smoker. This is probably how Patty and Selma took up smoking.

Jobs
He was one of the earliest male flight attendants, although he was ashamed of it. This was discovered when Marge boarded his plane to see her "pilot" father, but when she sees him performing stewardess duties, he yells at her not to look at him. This, along with several other plane-related mishaps, may have resulted in Marge's fear of flying. At some point, he also served in the United States Navy where he picked up a swearing problem, which nearly cost him his job as a baby photographer.

Swear jar
In the season 3 episode "Bart the Lover", Ned Flanders and Marge think Homer swears too much. Marge tells Homer the above story of her father almost losing his job due to his swearing problem. To solve this problem, Jaqueline put a swear jar in the kitchen. then every time he said a bad word he put in a quarter. It worked for Homer, and apparently it worked for Clancy, too.

Approval of Homer
Clancy first met Homer when he showed up at the Bouvier home claiming to be Marge's prom date. He was kind and complimentary to Homer, saying, "From what she's told me, I'm sure you're a solid citizen." Whether Marge had "sugar-coated" her description of Homer, or she had in fact been describing Artie, is unclear.

It is revealed later that his behavior towards Homer was still prevalent, even after Artie's arrival: When Marge returned home after the prom, she overheard her father stating that "when that Simpson boy showed up, it took years off [his] life", to which her mother replied, "Will you stop? She went with the good one." (She was referring to Artie.)

Non Canon Deaths
The cause or time of his death is undetermined. In an issue of the comic Simpsons Illustrated, Lisa reveals that Clancy died in an accident in 1985. What is known is that his death occurred some time after Marge met Homer and before she married him. We know this from the only episode where his death is mentioned (Jazzy and the Pussycats), where Homer says he had bought Marge a "white-noise machine" to help her deal with her father's death. Clancy is also known to be dead because he never appears with Jacqueline and she can later remarry.

In one Treehouse of Horror episode, he was eaten by King Homer at his and Marge's wedding.