I have two sons and a grandson. Stepdaughter is an only child until now. 

My step-daughter is a manipulative brat! We have her 50/50. She pouts everytime she is here and changes the entire vibe of the house. She literally sits in her room for five days straight. Only coming out to eat and shower than straight back to her room. I find it disrespectful that her dad doesn't tell her to at least great the rest of the household before locking herself in her room.