Same basic ratio here 70/30 - 60/40. We wanted to send our son in. He has been full time since Sept 15th, with a one week remote week after Christmas break. So glad we sent him in. He's thriving in school with the small class size.
We have had the whole 5th grade class home twice, the 4th grade class home twice and the 2nd grade class home once, because one the kids was exposed outside of school. So as a precaution, the whole grade would stay home. No transmission in school tho.