From Rapaire last October:

"My father was a Protestant, an Ulsterman was he
My mother was a Catholic girl, from County Cork was she
They were married in two churches, lived happily enough
Until the day that I was born and things got rather tough.

Oh it's the biggest mixup
That you have ever seen
My father he was Orange
And me mother she was Green".

Never heard it sung to that tune: the version I know is sung to the tune of "The Rising of the Moon" or "The Wearing of the Green".