Look at it again - - it's not a grandpa-granddaughter vibe, more like a father-daughter thing, a team effort. He's smiling and confident, as befits the older generation, she's more serious and businesslike, but her lips are slightly parted (incest vibe??) but that's even more effective as a team - - one's the smiling, outgoing sales guy, one is the smart, serious back-office guy (or woman.)
Whatever it is, that picture is powerful and appealing. God-damn those Republicans, they know how to package!