Art. 3 UN-CRC

Art. 3 UN-CRC (UN Convention on the Rights of the Child) reads (highlighting in the legal text by IntactiWiki):

UN Convention on the Rights of the Child: Part 1
Art. 3 - Wellbeing of the child

(1) In all actions concerning children, whether undertaken by public or private social welfare institutions, courts of law, administrative authorities or legislative bodies, the best interests of the child shall be a primary consideration.

(2) States Parties undertake to ensure the child such protection and care as is necessary for his or her well-being, taking into account the rights and duties of his or her parents, legal guardians, or other individuals legally responsible for him or her, and, to this end, shall take all appropriate legislative and administrative measures.

(3) States Parties shall ensure that the institutions, services and facilities responsible for the care or protection of children shall conform with the standards established by competent authorities, particularly in the areas of safety, health, in the number and suitability of their staff, as well as competent supervision.

IntactiWiki's non-binding comment:

(1) The child’s wellbeing is paramount.

(2) The contracting states grant themselves in (2) a guardianship, as it is anchored in the German Basic Law (see Art. 6 GG).