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This is the first year we combined both our 9 & 11 year old in the same curriculum. We have the Self-Study Extention for Older Students. My question is do we replace the regular history for our oldest and replace it with the extension? Or is this used in addition to the regular history? Thank you!

Extensions are an addition to what is in the guide on the normal pages. But is you are using Resurrection to Reformation with those ages, you wouldn't need the extensions. RTR is written for 10-12 year olds.