Let's see.....
Maternal grandmother never apologized to her children for her drinking or for allowing their alcoholic stepfather to leave them in the car on the way home from school while he stopped at the bar. Said stepfather never apologized once sober for his behavior or drinking, either.
Sister did apologize to me for her behavior once, but not for drinking. She also still has many ideas about how her life is all our parents' fault.
A stepson offered an apology with the twist that if I did not accept his apology then I was the bad person.
Can't say as I or any member of my family has received a sincere apology for any drinking or behavior while drinking.