Sympathy and condolences- my parents have been gone for awhile now, and I can empathize with having a "complicated" relationship with my dad. We spent a lot of time in conflict when I was growing up, and it was always something that overshadowed our relations in later years.
That said, all we can do is take the lessons and hopefully put them to good use. Sometimes people don't do a very good job of relationships, but if they are doing the best they can it is hard to hold it against them.
RIP Dad.