For starters, parents can't marry their kids, can they?
If only because they don't need to in the first place. Marriage is a legal construct to turn the two spouses into family. Parents and children are family already, so marrying would be redundant.
I was stronking lucky, I think I got her in like my third attempt. And now in the DrillElectric banner I finally got Texas and Exia in one ten-roll shot :3
If this doesn't prove Exusiai x Texas canon, few things can.