I'm having trouble deciding which one is correct here. I know that if it just was:
"In this modern era where everyone is busy", Would be correct subject-verb agreement. I'm not sure about the other two below:
"In this modern era, where everyone, adults and children, is busy.."
"In this modern era, where everyone, adults and children, are busy.."
I also have a small question of the usage of "where" here, Should it be where or when?