But I want to tell you a secret. I have three brothers and one is married. Moms who have sons BIGGEST concern is that you'll get so caught up with your wife that you'll forget about Mom and abandon her----or move far far away cause your wife wanted to. So it's good that you're reassuring her, but even better would be if you girl could talk to your mom-PRIVATLY. This is what she should say:
Choti Jaan is exactly right!
You are the MAN and you need to step up and take ownership of the issue. They are YOUR parents and you need to assure both of them (the girl and you mom) and please set expectations.
To your mom - Tell her that you like this girl but she isn't going to take me away from you. AFTER you get married - please set some one on one time with your mom on a weekly basis. Just you and her. She's just possessive since you are the only boy. WHOEVER you marry she will have these feelings
To you wife to be: Tell her that she means the world to you and so does your parents. You would liek to spend 2 hours with her on a weekly basis and hope she doesn't mind. Tell her that your mom feels that you will forget them because you like her so much.
If she feels like that she cannot deal with you parents - then call it off. It's unfair to put her in that position.