There is no such thing as a ``gay parent`` according to definitions in the dictionary:
from my 1887 Webster`s dictionary:
``parent n, [OF., fr.L. parens, -entis, fr. parere, to bring forth]
1. One who begets or brings forth offsspring; a father or a mother.``
source: http://www.merriam-webster.com/dictionary/beget
Are the courts redefining the word ``parent``?
``Gay parent`` ia a contradiction in terms, a falsehood because it does not fit the dictionary definitions.
Your erroneous spin on the definition would mean adoptive sterile couples or even a couple which used in-vitro fertilization techniques cannot be called parents.
By the definition posted, if a male provided the sperm, he's a parent. If a woman provided the egg, she's a parent. Homosexuals are not commonly sterile and thus can be parents even under the definition you offer from 1887.