I just viewed of my mothers will,and she left me out of it. My brother asked for my SS number but won't tell me why. Am I entitled to life insurance,?

You are an heir, so your are entitled to some information, which it sounds like you have gotten. If you feel that you may have some rights in your mother's estate, you should retain an attorney to explore that possibility. A probate estate, if one has been opened, is a public proceeding and the pleadings and other filings are public documents. If your mother intentionally did not leave anything to you in the Will, you are not entitled to anything from the Probate Estate (subject to a potential Will contest, if there is any basis to contest the Will). Life insurance, it there is a beneficiary designation, is not a probate asset; it will be distributed to the named beneficiaries. If you are a named beneficiary, you will be entitled to receive the life insurance proceeds, or a portion of them if there is more than one beneficiary. Without any more facts, I cannot give you a good answer. You should see an attorney and get some advice.