Devastated Dad Fighting for Twins

The day after Christmas, I learned I am the father to twins, Patrick and Ava. My twins were born on June 7, 2016 and abandoned in the NICU by their mother. After the mother and I had split up in October of 2015, she reunited with the father of her 2 older children. She told me that she was pregnant but believed her other children's father to also be the father of the twins. I reached out several times to her after their birth. She told me a DNA test was done and the twins were biologically his. She asked I not contact her again as it could cause problems in her relationship. Fast forward to 12/26...I learned from her Aunt that the twins are in fact mine. Not only did I find out this shocking news, I was informed my son Patrick was placed for adoption and my daughter Ava was left with family of the mother's boyfriend. I called the adoption agency and informed them of my intent to parent my twins and they told me to get a lawyer. My son has been taken away by an adoption agency and I haven't even gotten to meet him yet. My daughter is being withheld from me and the family who has her is demanding a DNA test before they will even let me meet her. I have seen some photos and these are my twins, who have been ripped apart from each other and are now both living with people who are strangers to me. I need an attorney to navigate the legal system, I've been trying for two weeks on my own and nothing has gotten done. The adoption agency who has my son has high powered attorneys and have already served me to terminate my parent rights. Please, help, in any way u can. I am a father of an 8 year old boy and 7 year old girl and family is everything to me