How can I handle false allegations of domestic violence?

My younger brother's wife as filled a false allegations against my family for domestic violence, saying we're demanding money in reality she and my brother stays separately and me and mother both stay in different area and my sister who is married stays with her in-laws at different locations. We don't have any type of contacts with her either by phone or face to face, but she claims that we are demanding money after She gave birth of a girl, it's been 2 years we have not seen the child after the child birth. And importantly my brother from 2 years he is maintaining distance from his wife. Due to her attitude. Now i kindly request to suggest me what to do.