I have a 10 year old boy who has been attending a very small Christian school in German Village for the last 5 years. We love it, even though it was a strain to our budget. My husband and I went to public schools (He in Plain City and I in Columbus). My son attended preschool in the public system, and I was not happy with what I found. We made the decision, for our child's sake, to send him to a private school environment that we felt more comfortable with. Even though he has a few special needs, he is excelling in the smaller school with his other classmates. The teachers were more willing to work with us and our son to find a solution that would help him succeed. In the public system, I believe he would have been labeled a "problem child" and routinely sent to the office.
I have family and friends who attended Gahanna schools and had no complaint. If we lived in Gahanna, I would have been much more likely to consider public education. The thing you have to ask yourself is this: How important is Christian education to my family? I can say it has enriched our lives far beyond the feeling of security that we have from our son being in a safe environment. My husband was brought up in a Christian home where the family regularly attended church. I was brought up in a home with strong values, but we did not attend church. I have benefitted as much from my son's Christian education as he has. (Because we were not members of the church, we had to attend Bible information classes so that we, as parents, would know what the school's doctrine was and what they were teaching our children.)
Simply put, make a list of pros and cons, check into the local Catholic schools and public schools, make note of the programs and extracurricular activities they offer, and see if they invite the parents to sit-in on a class or come to an open house. (Many private schools are beginning to hold open houses and new enrollment info sessions now. Call the school to find out when it will be and attend.) Together with your husband, you will come to the right decision for your family.
P.S. Don't let the mother-in-law influence your decision. I know how that is. :o)