He's only leaving his life insurance to my mom and to some other person that I don't even know.
He also didn't leave any to my brother or his grandsons. I would think that I would be entitled to it. So, if my mom dies, who gets the money?
Usually the owner of a life insurance policy names his or her spouse as the beneficiary of the life insurance.
You're not entitled to the life insurance, as the owner of the life insurance policy can choose who ever they want to receive the death benefit.
If mom dies, and she has a will, any money gets distributed as per her will, after all of her debts are paid off.
It may be unusual to name a grandchild as beneficiary on a life insurance policy, while you still have a wife and children living.
Here's how you can learn more about beneficiaries to life insurance policies.