Can you go from legal custody of a child to adopting them if they are not a blood relative but the parent consents?

Under the laws of all states in this country if a biological parent consents to the adoption by a third party of his or her child subject to a court order approving such, a custodian of the minor child can adopt the minor even if the custodian is not related to the minor genetically. I suggest that you consult with a family law attorney if you wish to pursue the adoption issue.