MMQC: I am asking these things bc I'm trying to get a picture of SL's father. Toward that end, I have been looking back at earlier posts. The following are partial quotes from several of your posts. Maybe thinking about them together will jog something else from your memory. For instance, how did he interact with you?
(1) It seems that he sometimes drank too much.
T1, Post 966: "... there were alway a collection of them on the corner of the table by where he sat. I can see him sliding beer tabs off the table like you would sweep crumbs into your palm only palm was coffee can and then not look and swipe then, put can on fridge."
T1, Post 1106: "As for SL and alcohol? Can't be sure. Father yes. Big factor."
(2) Drinking sometimes caused him to inadvertently disrespect/embarrass SL:
T1, Post 917: "During engagement SL misplaced ring. We looked and looked everywhere. As was her custom while doing the dishes she took ring off. She placed it on the kitchen table. SL's father used to save the pull tabs from beer cans and put in coffee can on top of fridge. Scooped off pull tabs after drinking beer that particular night and scooped up ring with it as it was white gold and put unknowingly in coffee can. We never thought to look there. Just by accident when putting more pull tabs in can noticed something shiny....SL says "OMG, it's my engagement ring. I'm never taking it off again for anything."
T1, Post 966 (again): "[SL] Never really spoke of any irritation toward father about ring. Now on the other hand about the incident at the party with him walking on his hands in front of classmates during party. VERY embarrassed. Argument insued and SL kicked father, very unlike her to do so."
(3) Considering the acrobatics at the pool party and his car, he may have had a wild side or macho streak.
(4) Except for the two outbursts we know about, he was unimposing and seemed to keep his nose to the grindstone.
T1, Post 920 (again): "SL's father was a quiet man. Not a huggy kissy family, neither was mine. Worked hard for a living. .... Avg. height. Not a tyrant or rule by fist type. More talkative after swigging back a few cold ones."
(5) He and SL had a compatible enough relationship to commute together to Wagner.
(6) But sadly, when SL vanished, they may not have made up after the pool party fight, and he was understandably saddened by the loss.
T1, Post 973: "Summer for sure. Maybe EOA? Yes, not talking to father nor father to daughter. To my knowledge neither party apologised."
T2, Post 776: "He was quite saddened. I believe it bothered him greatly."