Ok so I've had a few experiences with JQ the last few weeks - ADL-SYD v.v a few times. Always a party of 3, 2x Adults, 1x 3yo. Never bothered paying for allocated seating.
1st flight ADL-SYD - Kid in 3E, Mom+Dad in 6E+F with online check in T-28,. No worries, worst case scenario, kid can with...