Board Thread:General Discussion/@comment-173.170.42.111-20150523092327/@comment-4694601-20150523101026

"In addition, the Service is intended solely for users who are thirteen (13) years of age or older. Any registration by anyone under 13 is unauthorized, unlicensed and in violation of this Agreement. By registering for the Service Site, you represent and warrant that you are 13 or older and that you agree to and to abide by all of the terms and conditions of this Agreement." (Terms of Use of Wikia)

If your little brother used your account on Wikia and Staffs figured it out that there is a 10-years-old boy behind the screen, then the user will be blocked globally. If you have questions to this topic then maybe you want to use Special:Contact.