Since he needs the XP more it makes sense to let him get all the XP so I suggest not grouping.
You can group with someone within ~5 levels of you OR within 2/3rds / 1.5x your level (whichever is the bigger spread) for xp. In other words you need to wait until he its 12 if you are 18.
To get him XP quick just keep him buffed and healed. The damage shield is good if it doesn't KS too many mobs. Remember there is a cap on xp gained per kill so don't have him fight anything too hard or it is wasted xp.
The person/group that does the most damage gets the xp. Damage shields are ignored for this purpose, so if no one does any damage to a mob except for damage shields then no one gets xp.
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