Legal Question in Wills and Trusts in California

I'm not sure what you mean by "help bury his father." If his father's body remains at home, certainly a call to the Health Board would be appropriate. If you mean that he refuses to pay for the funeral, then there are other ways to deal with it -- such as you and the rest of the family chip in for the funeral, and then trying to collect from your nephew. In times of grief, people sometimes act irrationally.