I don't see a difference between a biological family and an adoptive one. I think the difference is more in the eyes of others around you, who might judge because you're not the same skin color as your parents.
I like to think I'm calm. Sometimes I have arrived at the ground in the morning in a bad mood - you're not always going to be in the best of moods are you? - but by the time you get into the ground and you have a brew then it's normally fine.