mums get this issue all the time, they seem to be afraid of loosing son if they didnt choose the girl. same thing happened to me, i myself miss judged the situation and made the wrong decision of my life, though parents think best for us, but sometime their choice is not good for the childern.
in this process I lost the person who loved me more than i did as i assume my loved failed to match hers. budged to parents demands and gone for arranged one, took 2 years to accept and things to normalise with wife but still life lacks the spark that I had with my choice.
so i suggest, go with your love, mum dad will agree if they see you stand firm on this issue. dont let the love of your life go!!