Use Usborne history first, move on to Kingfisher for the second cycle, then on to the Great Books. Five year olds can really just listen, color, draw pictures, and enjoy themselves. Third, second, and kindergarten stick with Usborne, as above. Sixth grader uses Kingfisher and outlining and fills in the first part of timeline. Fourth, third, and first as above, with Usborne.
Seventh grader does logic-stage study.
Fourth and second stay with Usborne. Three older children are following logic-stage recommendations. This year, the eighth grader fills in the last part of the time line and connects it to the Modern timeline done in fifth grade. Third grader still in Usborne book. Fourth grader still in Usborne.