I LOVE George MacDonald. I have kids ages 12, 9, 6, 3. The older 3 have enjoyed The Princess and the Goblin, The Princess and Curdie, At the Back of the North Wind. These are wonderful Victorian fairy tales IMO.
The Princess and the Goblin – see sample chapters, descriptions, reviews at Amazon via the link.
The Princess & Curdie – again, see samples and reviews; same characters as above
At the Back of the North Wind – see samples and reviews
My children have not been bothered by anything in theses stories. However, each family is different. We’ve read aloud many books with scenes that others may find frightening, I suppose. I suggest previewing for yourself as only you can determine what is appropriate for your family.