A child has one biological parent of each gender.<quoted text>
No it doesn't.
You have one mother. That is simply a scientific fact.
Children have one father and one mother. That's it.
Diverse gendered spouses are clearly not the same as redumbant gendered couples. As to human relationships, you can't have more distinct relationships.
Do you read what you write???
However, being a sperm or egg donor does not make one a Mother or a Father.
Parents are much more than genetic material, and THAT's the simple truth. There is not such thing as "diverse or redundant" spouses.
Can't you think rationally?