Leader of a Big Family Medal

and since each senior has to be higher than it's juniors, you'd have to train those 1000 accs

Hmm...really wouldn't be too hard, you could train 5 at once by leeching them with your main (limited only by how many comps/friends you have. If you know someone who is logging off, have them log to one of the nibs. At the rate of 5 at a time, you could leech them at HHG to 15ish in about 2-3 hours tops, so...600 hours tops.