My legal guardian dad had to write a blurb about himself and part of that is things he is proud of for his high school reunion. He wrote "my 2 kids and 8 grandkids". He has 2 biological children, i would be the third. I also am not part of the 8 grandchildren. It just made me feel sad when i read it, especially considering we are really close and i consider him to be my dad and i thought that i was his kid.