The Swiss authorities online
If you want to adopt the child of the person to whom you:
you need to meet the following conditions:
The child's biological father / biological mother is generally required to give his/her consent to the adoption.
However, if the parent is unknown, has been absent for at least two years with no known address or is of impaired judgment, this requirement may be waived.
If the child is old enough to give their consent (generally meaning they are above the age of 12), they must also agree to the adoption.
In the case of an adoption of the child of its partner, the competent authority must clarify, in the same way as the joint adoption or the adoption alone, whether it is in the best interests of the child.
The cantonal authority responsible for matters relating to adoption can provide information about the adoption procedure.