I give up rights because the guy she married had cancer and did not have long to live he just want to a son I still got my son on weekends well anyway he pass away about two years ago now his mom od on pills and passed away can I get my right back.

You need an attorney and will have to seek custody in the courts.

You might? But it is not going to be easy since once you give up those rights, they are gone. You will need an attorney and will have to file in court for custody to be given back.