Waiters/waitresses are lucky to make half, maybe even a quarter of that during their shifts.
Have you EVER worked in the restaurant industry? Most servers leave with atleast $80, and that's only on a short shift for a dead night. On a busy weekend night they can leave with $180 or more. This tip really isn't a big deal. The "dead brother!" thing is cute I guess, but I've seen much more impressive tips at my job.