I live in Pennsylvania and will be getting married soon. My fiance has an 11 year old son and I am wondering about legal guardianship. He currently has full legal & physical custody of his son. How would I go about obtaining legal guardianship and what rights does a legal guardian have over a child? Does the biological mother get informed that someone is applying for legal guardianship? I feel it's the right thing to do as I will be getting married and currently live with them and I want the best for the child.