If you are looking for common sense, real world self defense, Jiu Jitsu is not were you should be looking. Look into Krav Maga for the kids. That is the most useful system taught, hands down. Jiu Jitsu, Karate, Tea Kwon Do etc are great as long as everyone is playing by the rules, but there are no rules on the street.
http://www.ohiokravmaga.com
Or contact Jon (blk00ws6) he is an instructor there.