My step daughter is 6. Her dad has raised her by himself since she was 9 weeks old. The girl is brilliant and helpful. However, we are running into issues with things like putting clothes away - she hides them instead and then lies about it.  This has been an ongoing issue for months. I've been asked to step in as "mom"  and have gladly done so. We now have my seven year old son and  his daughter.  I try my hardest to make sure they are both treated equally because I know that feeling of inequality in a blended family.