It's hard for parents to simply accept a change that you want that they would rather not have to deal with.
Your Dad sounds like the one to reason with and maybe find out the root of why your Mother doesn't like this.
Iron out these kinds of things right away with them and others, don't let them pile up into one to large to deal with.
I can see you're considerate of their wishes, but work into it slowly and you can't demand acceptance, it is earned.
But I think you can do that without to much problem, just be helpful in letting them understand your point of view.
Give it plenty of time to sink in and be willing to answer questions they have as honestly as you can.
Trust, and parent can spot dishonesty a mile away, is key to you getting, earning that acceptance.
Stay in touch, good to see you here.
Ativan