Del. Code tit. 14 § 1061
Previously elected or appointed school board members of component former school districts and all members of the board of a subdivided high school district board who reside within the reorganized school district, including those members elected at the regular election in May 1969, shall continue to serve out their respective terms on the school board of the reorganized school district constituted and established on July 1, 1969, notwithstanding any other provisions of this title to the contrary, except that in the case where a reorganized school district is composed of 1 or more non-1-through-12 grade component former school districts and 1 or more component former school districts previously providing grades 1 through 12, only the member elected in May 1969, in each of the non-1-through-12 grade districts will serve out that member's term as an interim member of the school board of the reorganized school district along with all of the school board members of the previously 1-through-12 grade district or districts. Subsequent elections or appointments in the reorganized school districts shall be for 1 member at large in the reorganized school districts until the school board meets the criteria of this subchapter. If it becomes necessary to fill a vacancy for any reason other than the expiration of term, the new member must be selected from the residents of the previously existing school district and in accordance with § 1054 of this title.
14 Del. C. § 1061