One, Two,...Three?

Reported:

The words “mother” and “father” will be removed from U.S. passport applications and replaced with gender neutral terminology, the State Department says. 

“The words in the old form were ‘mother’ and ‘father,’” said Brenda Sprague, deputy assistant Secretary of State for Passport Services. "They are now ‘parent one’ and ‘parent two.’"

Will there be "Parent Three"?  After all, you just can never know in this modern world?

^