It's strange that the son of the judge in training was living in his own apartment on the property. He's only 17.
Have you heard whether this family are Aruban natives of immigrants from the Netherlands?
http://thedailyherald.com/news/daily/i21/girl21.html
Van der Sloot was born in Holland, but has lived most of his life in Aruba
It's strange for a closeknit, loving, functional family. I knew some people with this kind of arrangement. They'd give in to the demands for peace and quiet.