I am so livid right now. My sons bio father has been out of the picture since my son was born and…

I am so livid right now. My sons bio father has been out of the picture since my son was born and removed from all paperwork. I removed him from his school paperwork last year. Today I get a thank you card with his and my name on it when it clearly states in his file my husband is acting father and in the process of adopting him. I called the school and told the actual teacher about it and he said he would address it with the aid. And he would throw out the family tree they have been working on. So you mean to tell me that his bio father was on there and they were teaching him his name?!? 👎🏼