My question involves criminal law for the state of: Kansas

Hello, my brother has been working with a 14 year old girl. Since she is his assistant, they used to see each other quite often and that girl is a huge flirt from the way she talks to him to the things she does. So yesterday, she caught him in a weak moment and they kissed, he said that nothing else happened, and of course i believe him. Now she is accusing him of forcing her into his house and trying to touch her intimate parts, but of course she is lying. The police went and arrested him and I just don't know what's going to happen. What can I do to help him?
Thank you very much in advance