We only asked biological parents if they would like to give saliva samples.
If a parent did not know if they were the child’s biological parent, they still had the option to provide a sample if they wished. No feedback was given to any parent who gave a sample regarding whether or not they, or their child’s other parent, are the biological parent of the child.
If a child was conceived using egg and/or sperm donation, donors were only invited to give a sample if they were their child’s legal parent.