I went for a very literal interpretation of the source material.
This requires that panels 1/2 be set side-by-side, panels 3/4 be set side-by-side, and panels 5/6 set side-by-side as though we were doing comparisons. Sally and Bobby progress in age from panel-tier to panel-tier at the same pace. The two families are not related, so feel free to make them very different.
Mom poking her head into a room where an unhappy toddler boy sits on the ground among some toys. She is wearing a smile.
MOM: Wipe those alligator tears, Bobby.
Dad holding crying toddler girl as he panics not knowing what to do.
DAD: What's wrong Sally?!
Bobby, a small boy, climbs on ladder about two feet off the ground as mom calls out telling him not to go so high.
MOM (OP): Don't climb so high, Bobby!
Dad and Sally, a small girl, sit at the top of a jungle gym, both holding on with one hand raised in the air in triumph!
DAD: We did it, Sally!
Bobby, a teenage boy, sits at a table a large textbook in front of him and him looking up at his mom with his phone in his hand. He has a worried look, like he was just caught. The Mom stands over Bobby with a disapproving, stern expression.
MOM: You won't do well if you don't study more.
Sally, a teenager girl, sits at a table over a large textbook that is open in front of her. The Dad stands next to teenage daughter with a wide smile. The teenage daughter is rolling her eyes with a small smile on her face.
DAD: Aren't you done studying yet?
The mom and the dad sit several chairs away from each other in a dark auditorium. The mom beams with pride while the dad is wiping away a tear from his eye, a smile on his face. The mom sits on the left side of the panel and the dad sits on the right side of the panel. Note: Leave plenty of room above them for complicated word balloons.
ANNOUNCER (OP): I would like to announce the co-valedictorians Bobby [COVER UP #1] and Sally [COVER UP #2].
MOM: That's my boy!
DAD: That's my girl!
Lettering Note: The mom's word balloon should cover up the section in the announcer's balloon called "COVER UP #1". The dad's word balloon should cover up the section in the announcer's balloon called "COVER UP #2".