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However, don't create divisions. Let people know that you'd appreciate their support for your wedding and for your intended partner. It's their choice to react as they see fit, but seeing their support for you and your future spouse will help your mother to think through her concerns more objectively. In some cases, it may be helpful to have someone your mom trusts implicitly have a discussion about the marriage with her. This person could point out the opposite side to her objections in a way that is less fraught with emotions than between you and your mom.
Find a supporter or two from within the rest of your family.