Yea, disperse is all that will work. Btw, please try to put the posts where they go, this would belong in the tips forum. This forum is where we talk about breasts, negros, and politics.
How to destroy the little familiar you made? Well, use your mightly greatsword to cut it into halves, with the protection of your followers. What? You don't have followers and is a weakling summoner? Let it kill you, then.
Surely you can hack your familiar. I killed my familiar everytime I entered a town, when I played a summoner.