Did i do the right thing?

Sorry this isnt BC related...but im stressed out over a situation and need to vent and maybe have some input of reassurance that i did the right thing.

So here it goes. My cousin Georg (Stacys brother) was diagnosed with a very rare terminal disease about 4-5 years ago called stiffmans disease...roughly only 130 people have this in the world. From what they know about this disease they usually dont live more than 5 years. It is a horrible, nasty disease. Their muscles pull themselves away from the bones and their body becomes stiff...this just is a small part of what he goes thru and its very painful and he can hardly walk and hes very weak and he is only 41 years old.

He has a 12 year old daughter that lives half with him and half with her mother. The mom lets her run the streets and do whatever she wants when she wants. The mom is an alcoholic and drug addict. Georg just got his daughter again 3 weeks ago.

Now that ive set the stage now i can tell you what happened.
Yesterday about 5pm i got to his house and found he was having another massive attack from his disease he has swelling on his brain so it triggers some bad side effects and with the muscles attacking his legs to were he couldnt move his legs and in severe pain. I called the ambulance and off to the hospital we went. With his disease these attacks are brought on by high stress. We were in the ER till about 11pm. He was actually sent home cuz the docs have no idea how to treat his disease...Georg is the only case that i know of that the docs ask him what should they do cuz they have no idea how to treat him. Weird i know but there are only a few docs that know how to treat it...so usually he tells them what they need to do and it usually works till he sees his doctor. Yes hes in the ER alot.

While i was in the ER with him I found out that his 12 year old daughter has been physically abusing him. She would punch, kick and bit him and would draw blood. His body cant take that and hes to disabled to stop her visious attacks. So me and my sister set her up. After leaving the ER we left her alone with Georg and during this time he had his cell phone on so i could hear everything that was going on (of course she didnt know this), later 911 dispatch was also listening in without her knowing, cuz she was getting to the point that she was going to get violent with him ...thats when i walked back in cuz i was never very far. Shortly after that the police show up and she was admitted in a phyic unit.

Georg was very upset about the situation cuz he didnt want to see his daughter go thru this and hes a good dad but he lost control once she figured out how much she could get away with cuz he couldnt do anything and she took advantage of the situation and him. I couldnt believe her actions after just taking him to the ER she was willing to put him thru more abuse like that. Once she leaves the mental health unit she will be going to a detention hall cuz i refused for her to ever be alone with him. Georg knows it had to be done but i just kept telling him hes got to show her this isnt normal and had to do a little tough love.
Please tell me i did the right thing cuz last thing i would ever want is to split up a family!