looking at it scientifically, genetics absolutely do have an effect on how you grow up.
every moment of your being is spent reacting to what is going on around you. Lets say your seritonin flow leve is lower than someone elses, then you will react to the situation differently than you would otherwise. Genes are not nescessarily obvious concrete things (such as hair color). you may be nothing like your parents but your genes have directly influenced that as well. You have reacted to things they have done and said, with the genes they gave you, affecting your decision.