Finders of Lost Loves

During my Christmas holiday my oldest brother came by to visit he and his lady friend. While chatting we talked about the disfellowship of our family. My sisters never speak to me or include me in anything they do and for most of my life I’ve never understood it, until my brother shedded some insight on the matter. He also told me that I have two other siblings out there in the world by my birth father who is deceased as well as my mother. Now I never had a relationship with my birth father but I met him a few times in my life, but never knew I had siblings by him, he never told me or I just don’t remember. Now my brother told me I am the oldest of my birth fathers children I have a sister and a brother outside of the siblings I was raised with. I looked on my birth certificate to see what information I could use to try  locate my siblings but there really isn’t much to go on not even my father’s birthdate just his name and the state he was origianlly born in and occupation the time I was born. I would love to locate my brother and sister, but have no clue how to find them or if they are even still alive. I don’t even know their names or if they eve know that I exsist. Has anyone ever been in this situation and if so did you search and how did you go about it and what was your outcome?