From my point of view, nobody can be fully trusted, but by trusting someone a person always measure risk and must make concessions with himself.

I find it surprising that nobody has selected a friend/friends, because sometimes these people are most honest, unbiased, incorruptible. I would put administration on a last place, because it is the most uninterested option in keeping what you value. A family is also a tricky selection. How many times we have heard how most close betray for their own benefit. And you know, trusting ourselves can play a bad joke to us. Nobody cancels emotions. 

The one who should really be trusted a seed - a dog. Dogs never betray their owners.