Father's Day can be a sensitive subject for some people who grew up without a father. Yesterday, Oliver Hudson took to Instagram to call out his estranged dad, Bill Hudson. The 38-year-old actor held nothing back, captioning a picture of himself, his dad and his sister Kate Hudson with, "Happy abandonment day... @katehudson."

This is not the first time Oliver or Kate publicly slammed their biological father. Both actors have gone on the record to say they consider Kurt Russell their real father. Russell is the longtime partner of their mother, actress Goldie Hawn, and has been present most of their lives.

Bill does not have very kind things to say about his children either. He released a tell-all book in 2011, "2 Versions: The Other Side of Fame and Family," in which he called daughter Kate a spoiled brat. "I love Kate, but... She has done stuff which is just awful. She is a spoiled brat in my eyes and, at the end of the day, she should meet her little sister. I should meet my grandchild and she should help her grandmother," he wrote.

Kate decided to take the high road Sunday. Instead of calling out her father, she posted a very sweet message to her "Pa" Russell.