It's the second largest private school network in the country and this week, it celebrated Lutheran Schools Week.
And Friday in Eau Claire, the Lutheran Church, Missouri Synod schools decided to get grandparents in on it.
There's a 45 year tradition at Eau Claire Lutheran school. The 88 students brought grandmas and grandpas in to mark the occasion.
There are more than 25,000 lutheran schools in the nation with more than 290,000 students.