Should his Guardian also be served?

My neighbor, whom is 54 years old, borrowed my truck to go less than 2 blocks to get things from his storage. In the process of getting his things, he caused over $2,500 damage to my truck. My insurance nor his will pay for the damages.

So, I guess my only choice is to take him to Small Claims court.

He's on disability as I am. He though can't do his own finances, so Social Security gave him a payee to do his finances. Since his payee's name is also on his car insurance card, I already plan on taking this guy to small claims as well, if they don't agree to just pay me out right.

This neighbor though, also has a Guardian. His aunt who lives in another state.

Does anyone know if I end up having to go to small claims court, if I will also have to serve her papers to attend the hearing, since she's his guardian?