Have to agree about the education thing but would also urge you to do it. If you don't do it now (whilst you have the impetus), you may not do it again. Prepare for the education problem by looking into what they should be learning at those ages. You will be spending a lot of time with them, so could easily devote a few hours a day to teaching (at that age, its stuff you can do). They will miss the contact with other kids but in Europe this is easier to overcome (especially if you stay on campsites).