Almost all male U.S. citizens, and male aliens living in the U.S., who are 18 through 25, are required to register with Selective Service.
according to................
http://www.sss.gov
I do think your uncle will put you behind bars for this infraction......just like your uncle doesnt like people that dont pay taxes....like tax evaders....
http://www.treas.gov/irs/ci/tax_fraud/