My brother was taken advantage of by pedophiles and he isn't telling us the names

I need advice to help my mom. I'm 20 and i live with my mom 12 year old sister and 17 yo brother. We live in Houston, or should i say the outskirts of Houston? Its called missouri city but its still in the houston metropolitan area. My brother is getting ready to move into his own apartment because of issues with my mom drinking but she's getting help for it. I recently found out my brother had sex with a woman who was into her 30s and another woman who was i wanna say 28 but i dont remember. I only know this because of a loud argument he got into with my mom. We are trying to get the names of the women but he refuses to tell us so hes on punishment. But I was thinking could we bribe him into telling us? Like we help him pay off his new apartment and he tells us their names so we go to the station. It sounds fucked but it's an act of desperation. What does anyone else recommend? Would that get him to tell us