With those two, I mean in general, I think Leti is the Boss. I think she's the one who holds all the emotional cards. In most relationships there's always one who follows the other, and I think he follows her. He might be the future King and all that, but at home, she's the one he looks to.
That's just my theory. Nothing to do with people squeezing hands in photos.
Good theory but I disagree. I think Flip's the one in charge...after all, he's the long-awaited, much wanted male heir and seems to be used to getting his way in whatever he wants. I'm sure he loves Leti, but I doubt he'd let that love interfere with him being top dog around the palace and around their house. And Leti? I think she's so delighted to be where she is that she's willing to put up with whatever bs Flip tosses her way.