<human>: Could you distill the essence of the text into 1-3 sentences?

I'm 24 years old and have been friends with this guy and his family for over a decade.  One night in February, him and I go back to his place (which he shares with his older brother) after a night of drinking.  He stayed sober so that he could drive us back.  We are smoking weed in his bedroom when we suddenly hear a crash.  We go outside to find that his brother is extremely drunk and has rammed his truck into the back of my car.  His brother is too drunk to even exit his vehicle, so I put him to bed before assessing the damage to my car.  Apart from the ruined bumper, my car didn't seem to suffer any damage.

Here is the part where I become an idiot.  I am drunk/high and do not want to deal with police.  My friend's brother has previous DUI's as well as two kids from different mothers (that, for the most part, my friend primarily raises), and I don't want to play a role in my friend's nephews having to deal with their father being in jail.  I talk to my friend and with my friend's parents, and they all verbally agree to replace the bumper if I do not call the police on the brother.  I agreed to this and do not report anything.

Flash forward a few months.  The brother has been difficult to deal with and apprehensive about replacing the bumper.  I am preparing to move from Mississippi to North Carolina and want my bumper fixed beforehand.  My friend's family owns a mechanic shop where the brother works.  He finally tells me to drop my car off and he will replace the bumper before I move.  Well, it is now five days before I move, and I recently found out that my friend's brother has just let my car sit in the garage for nearly two weeks without even attempting to fix it.  I'm assuming he is just waiting for me to move and hoping I drop it.  The brother doesn't respond to my messages, and my friend says it is not his responsibility to make sure it gets fixed anymore.  Is there any legal action that I can take to get my bumper replaced or to receive the costs of repair from the brother?
<bot>: Decade long friend's brother drunkenly smashes my bumper.  Friend and family promise to fix it, so I don't report it.  Their word ends up being worthless.  Can I take legal action?