Originally Posted by
herzmeh
That's the case. I'm trying going on a whim and assume everything will be ok if we tell the airline that they won't be using their Y ticket (it's a kid anyway). Just wanted to see if anyone had any experience with this.
After the outbound of the return is flown, split the affected pax off the PNR. Once that's done, have the affected pax offloaded off the return flight (the one you want to redeem avios for) and then book the award.
You can then request a tax refund for the affected pax on the Y ticket.