Going to court for criminal trespassing whats the worst that could happen?

i went to this ladys house where my disabled brother was spending a lot of time to confront her about an issue. Apparently she has been telling my brother he needs to move into her house and put his ssi check in her name. so i went down there to let her know that there is NO WAY that is happening. i got there she wouldnt let my brother out the house so i called the police. they arrived & told me because i do not have power of attorney over him there nothing they can do & that i would have to leave & if i came back i would be arressted. i told the officers thank u & they left while i was still there & then i went home. 20 mins later i walk outside with my husband to tell him bye before he leave for work & here come the cop pointing a gun at my hubby & then arresst me for criminal tresspass