Knight time

There was once a knight in shining armour,
On a great white steed he rides
He as turned his back on the killing,
Deciding to change sides,
He told the last female dragon
That he would spare her life,
And to prove he really meant it
He took her for his wife.
Now I know
This is
No fairy tale,
I'll tell you why I'm sure,
I married the son
Of that knight
And that dragon's
My mother in law.......