HI Jessia!
There are several curricula that meet your needs!
Master books
Beautiful feet Books
Mystery of History (you can adjust and listen to audio)
My fathers world
Heart of Dakota
Sonlight
You can also gather a book list for free online, and do a simple timeline or just notebook!
You can get Beautiful feet books teachers guide, and borrow the books from the library.
Ambelside online is a FREE curriculum.
You can also goto https://www.halfahundredacrewood.com/ she has book lists and video lists or movies that go along with history. There is soo much you can do with History at those ages. Your older one can do a deeper dive into a person or event in history, make an art sketch, write a paper, act out a scene, do a speech…the list goes on! Youtube can be a wonderful place to find ideas as well.