Give love to your daughter-in-law as your daughter. This will help you to make a healthy relationship with your daughter-in-law.
Your daughter-in-law will take all your responsibilities on her shoulders but take care that this procedure should go slowly. Do not make a burden of responsibilities on her. This can be dangerous for your relationship.
Do not scold or abuse her for small-small mistakes. Let her take her own time to make her comfortable in your family.
Let her go for outing with her husband. Do not interfere too much between your son & daughter-in-law. Do not say any bad thing about her in front of neighbours & relatives.