This quest will expire after the events at the Mechonis Core.
Bring Back My Son! is a Timed Quest in Xenoblade Chronicles. It can be received from Merisa on the first floor of Alcamoth, on the walkway far to the north of the Imperial Palace, nearby the rest station. Her son, Mir'leiz, must be spoken to first. If Sharla is in the active party, she will comment.
"Mir'leiz promised not to do anything else foolish so his mother won't have to worry any more."
Upon completion of this quest, the Affinity Chart will change: