Calculation

"Hey mom, you're the biggest in this family, dad is medium and I'm the smallest!"

"Oh no, no darling, dad is 5 years older than me, so I'm the medium."

"Mom, no! Can't you see you're the tallest?"

"Ohhhhh! Then you're right, Alice! ahahahahahha"

Alfie: "Mmm!" (cracking a smile from his corner of the table).