Set a few friendly rules
Flag football is supposed to be a low-contact sport, but if cousin Stu is secretly fuming about Gam-Gam’s unspoken favoritism for cousin Craig, it may not take long for that “friendly” game of Pass the Pigskin to turn into a passive-aggressive (or just regular aggressive), elbow-throwing, knee-tripping, shove-in-the-back game of Settle the Family Feud.
Most flag football injuries are due to contact with another player, which is strange, since it’s flag football. But if you can effectively manage that contact, you might be able to limit or eliminate injuries.
All players should agree on proper tagging technique, and what constitutes a penalty (for instance, what’s the difference between a two-handed tag and a two-handed shove?). Tackling should be considered completely off-limits, since we’re playing touch football here.