I should tell Nikola that his problem is a social one: that to support and to protect himself subsequent to his parents' deaths, he must improvise a family. This in essence is what he began to do with David Gonzales and Michael Ochoa.  The fact that Nikola failed in this attempt does not mean that he should not continue to try.  The obvious place to begin is his younger brother, the relationship to whom he should try to repair, if only as an experiment in humanity.  I know nothing about the history of the conflict between them; but I think that if only as an experiment in human relations, Nikola should talk with his brother, listen to him, try to see the world from his brother's  point of view, and try to ascertain the terms of possible reciprocal accommodation.

I would not deplore the fact that his brother sees the world from a financial perspective.  Nikola should also learn to do so.  Psychiatric hospitalization costs about $800 per day $292000 a year, $5840000 in the course of 20 years.  I suggest offering to subsidize the prospective "new" family member with a sum of money, perhaps 10% to 20% of the costs of hypothetical hospitalization, with the stipulation that this subsidy was contingent on the beneficiarys help in avoiding Nikolas hospitalization. It would be a win-win situation.

In this perspective, Nathaniel would also be a prospective "family member" and if necessary, a prospective "guardian".