My relationship with my parents was not good in my late teens/early 20's-especially with my dad. I spent a lot of time moaning to my much older sister and brother.But I think it is normal at that age because you are finding your feet as an adult,and need to test the boundaries.
Then when I was 22,my dad became ill and died when he was 69...and tho I was planning to move out,I instead stayed on with my mum.
We became much closer over time...she died at 86, and she still remains in my heart as a good mum who did her best. At the time, my ex said he loved her more than his own mum.