AITA for kicking my brother and his family out after he tried to give me a whore-a-vention?

I am having hard time knowing whether I did the right thing when I kicked my brother and his family out. <br><br>My brother and his wife watched a youtube video where a guy high on drugs talked about how any woman that has had sex before marriage is not marriage material because they would not be able to satisfy their carnal needs therefor your marriage will fail. <br><br>My brother and his wife are now conviction that this is the truth and since both of them have had sex before marriage they think that their marriage is slowly disintegrating because of this. So they came up with a plan and made a appointment with a escort who is experienced in healing marriage crisis and she will have sex with them both as a couple in a ritual of healing and renew their marriage. It is very expensive so my brother and his wife saved up for months to be able to afford it. <br><br>They made the appointment in my city and they asked me if they could stay with me for a couple of days and I said yes. <br><br>When I heard what they were planning I was horrified. I tried to reason with them. I asked them what they thought it meant to heal their marriage crisis by having sex with another woman. They told me that as long as the ritual is performed correctly it will work. They said they were conviction that this ritual will fix everything between them. <br><br>I was so dumbfounded that I couldn't say anything and they took my silence as agreeing to keep their little secret. They told me how they have lied to their friends and family about where they really are. They made up some story about my health and that is why they needed to be with me for a couple of days. They made me promise to not tell anyone or to say anything negative about it. <br><br>I told them that it was wrong and that they were lying to everyone and manipulating me into helping them keep up the lie. They got very defensive and argued that this ritual will make their marriage last forever and that this is a once in a lifetime opportunity and that they can't let it go to waste. <br><br>I told them that I couldn't keep this secret and that I had to tell the truth. They begged me to please reconsider and said I didn't have to say anything. I told them that I couldn't stay silent while they destroy their lives. They said they would do it with or without my help and if I didn't want to help them then they would stay at a hotel. I told them to get out. <br><br>They went to stay at a hotel but told everyone the lie they made up about my health. Now everyone thinks I am sick with some kind of stomach disease and that it was so bad that I had to be hospitalized last week. <br><br>Now everyone is asking me what really happened and I don't know what to say.