My father passed away from cancer I am his only child and my stepmother said he did not have any policies I called the funeral home & he had 3

My dad died my stepmother said he didnt have any policies i called the funeral home and they said he had 3 policies I am my fathers only child and I don't believe my father would have not left me anythingvbut I don't know how to find out if my name was on anything she ask me for my ss# and said she needed it for my fathers social security but I feel like her and her daughter forged documents to receive moneys from my fathers death I just want to know why would she lie about his life insurance policies.