Out Of Bounds

Tell him the same thing we'd tell teammates after practice when they shaved their scores down when they played a shitty round. 103? 103? that sounds about right if you stopped counting on the 15th hole

He's your brother? Punch him in the nuts, tell him to stop cheating, and then schedule your next round together.

Exactly what I was thinking. He may hate me for it for a while, but if he’s gonna be on the team, he needs to start playing by the rules. 

It’s time for you to introduce him to the rules and etiquette of golf before this becomes a habit. The sooner the better. Sure, no big deal if he is only planning to be a casual golfer,  but if his intention is to eventually make it on the team, he needs to be honest about his scores and start practicing telling the truth now. 

I would just let it be. If he hurt his leg and it was just a casual round, then I do not see the issue really. Does he turn his scores in for handicap purposes? I play with guys that do this all of the time. It doesn't bother me. My thoughts are that they are out enjoying playing. Not all of my friends are sticklers for rules; they just like being out there on the course. In the case of him doing this in a match as part of the team, sometimes you just have to allow people to make their own decis