Here is the school's response to the dismissal, from their website:
http://www.ocschools.org/index.cfm
Thank you for your inquiry regarding a student that had been enrolled at Ontario Christian School. The student is not attending Ontario Christian, as the family does not meet admissions criteria. The ministry of Ontario Christian is to promote discipleship of Jesus Christ as defined by the Bible and consistent with historical Christianity. The school forms a voluntary partnership with parents who seek the same discipleship. Therefore, the school requires that at least one parent be a confessing Christian and active in the local Christian church. In this case, the parent does not meet the criteria by participating in a homosexual relationship. We regret that this relationship was not disclosed at the time of admission, as that information would have prevented enrollment and the occasion for misunderstanding. The mission of Ontario Christian School is to provide for the children of Christian parents a Biblically-based, quality education that nurtures students to grow in knowledge, conviction and maturity; therefore, our focus is to equip students with the vision and skills to engage all relationships and culture under the authority of Jesus Christ.