I treat my daughter in law like my own daughter and so does my wife and she loves us to bits as well. We joke in the family that she is our daughter and our son is our son in law. It is a matter of how you deal with each other and how much love and respect you show for each other. From day one I treated her the way I would like my own daughter to be treated once she is married. In our culture the girl comes into a new family and it is the responsibility of that family to make her feel welcome and comfortable and if you do that she will respond positively as well. I couldnt have asked for a better daughter in law.
MashaAllah. May Allah swt showers His countless blessings on you and your family. May He bless you all with eternal and everlasting happiness. aameeen!