State of Ohio's High School Guidelines on Athletics:
If a student transfers (changes) high schools at any time after establishing eligibility as a ninth grader (either by attending a school for five days or playing in a fall sport prior to the beginning of school), the student is INELIGIBLE at the new high school for the first 50% of the maximum allowable regular-season contests in those sports in which the student participated during the 12 months immediately preceding this transfer.
NOTE: For purposes of this bylaw, a student is considered to have participated in a sport if he/she has entered, if for only one play, a scrimmage or contest at any level of competition/contest (i.e., freshman, junior varsity, and varsity). No ruling is required from the Commissioner’s Office, and no paperwork is necessary if a student transfers and cannot meet an exception to the transfer bylaw.
"A student whose parents reside outside the State of Ohio but within the United States will be ineligible for interscholastic athletics in a member school. (See Bylaw 4-8-1 for eligibility requirements for students whose parents live outside the United States).NOTE: A biological or adoptive parent must reside in Ohio."
There are specific waivers for both the state and the Archdiocese that can be pursued on a case-by-case basis.