You might disagree, but Andrew would be the loviest person with children, not the kind that runs around with them and make baby voices, but the kind that protect them with everything in his power and let them mess with him as much as they want.
Like, if Aaron's kids want to put a princess tiara and feathers on him, he would stay still and let them have as fun as possible.
And when there isn't many people around, he would smile. Just a little.