It is both a blessing and a right.
Aside from being an inalienable right that is endowed by the Creator:
United Nations Declaration of the Rights of the Child (1959)
Principle 6
The child, for the full and harmonious development of his personality, needs love and understanding. He shall, wherever possible, grow up in the care and under the responsibility of his parents,
Convention on the Rights of the Child
U.N. General Assembly
(12 December 1989)
Article 7
1. The child shall be registered immediately after birth and shall have the right from birth to a name, the right to acquire a nationality and, as far as possible, the right to know and be cared for by his or her parents.
Just out of curiosity, is there somewhere in either of those UN declarations that defines “parents” as a child’s biological mom or dad or both? Otherwise, I don’t think any single parent or gay couple with children would disagree.