Heehee probably! I can see him carrying Yuna around on his shoulders, especially if she was tired or too short to see things, and possibly Lulu when she was still young enough to enjoy it. I think he would have been protective of her, too, when she was growing up. Putting himself scowlingly in the way when she reached an age that boys were starting to take an interest in her.
I had a dream once about the four kids (Lulu, Yuna, Wakka, and Chappu) as WW2-era orphans waiting together on a train platform waiting for somebody to come pick them up, thought it'd make an interesting AU fanfic lead, realized that dragging WW2 into Final Fantasy is kind of problematic, and then forgot about it. Somehow I didn't make the connection to Narnia until now, even though that is almost certainly where the dream came from.