Hi Adrian,
you can select and pay for advance seat selection at time of booking it is from meory $20 per seat per sector although I'm not 100% sure. I know advance seat selection is free for Qantas frequent flyers with silver status and higher. I'm not sure how available row 52 will be as again these seats are generally reserved for higher tier status PAX although it is worth giving it a shot and you can always ask at check-in. Hope this helps a bit, sorry not sure about the limit on number of kids in a row.
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