Can I contest my mom's Will?

Question Details: My mom moved in with my brother 8 years ago because her health was failing. She passed away a few weeks ago and I just got a copy of her Will and my brother now gets everything except $15,000 which goes to his wife. The will was changed 3 years ago and the old Will from what I was told left the estate to my brother, me and my 2 nieces and a nephew. My brother was to get 1/3, me 1/3 and my late brother's 3 kids split 1/3. I feel that my brother used undue influence to get my mom to change the Will. Of course at with most things it is more complicated then that but that is the gist of it.

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