I am sure you know to what extent our religion stresses on obedience and respect to our parents, no matter how old we may be. The necessary actions you must take should in no way wait for your wedding, or be connected with anything else. It should be something immediate and straight away.
Let's say your circumstance is very difficult, like having an abusive parent, or a parent that was never in your life, or other scenarios that unfortunately could occur, it still does not mean you sever your ties with your parent. Maintaining the relationship is very important, and in the worst of cases, doing dua for them is the least you can do.
Always remember the hadiths that say our path to God is through our parents, and we will never enter Heaven if we are disobedient to our parents.
In your spare time, read the hadiths that are on this link:
With prayers for your success.