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How to hold the title is a question for estate specialist. Usually, if couple is married the title is transferred to both of them.
Regarding the gift tax there's no tax consequences to you. However you mom will have to file gift tax return and claim the fair market value of the house as gift to you. There's a lifetime exclusion of 5.43M which means she can gift 5.43M during her lifetime without having to pay gift tax. It will most likely be just informational form with no gift tax consequences.