Sadly, you can't officially date Yosuke. You can hug him though, and the bromance is so heavily there that they may as well be in love. Also, PC has a mod to fix that horrible oversight of the dev not letting us date him. xD
I did enjoy person 3. But it was the entire cast of teammates in Persona 4 that just won my heart. There's not a single one on the team that I dislike. The music is my fave to, the bosses, and of course the game also has the best bromance(though I insist its a romance) in my opinion. But I'm extremely biased when it comes to P4. xD Anyway, I blame this topic on both the theme and the looks of your two male kids grown up. xD