What to do about theft from an estate?

Question Details:

My mother passed 3 months ago. She left no Will but she did have a life insurance policy, 401k, car, bank account, and personal property. All together, without the life insurance, everything is worth approximately 20k. I am 1 of 4 siblings. I have obtained a small estate affidavit from the county. Our youngest sibling has stolen the money from our mom's bank account, transferred her car title to her name and changed my mother's life insurance beneficiary information from my other sister's name to her own (then kept the money). Yes, we have proof. We want to sue. How do we proceed?

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