Of course it is legal, and if you have thought it through and have passed the tests in order to be "qualified" to teach them, then by all means go for it!
I don't like it when people say, "But it's not mainstream!" because aren't we trying to teach the children of today to think for themselves and be proud of their individuality? If the only friends children have are the ones from school, that is kind of pathetic...
I've worked in schools throughout the capital city area, and I have noticed a lot of blatant bullying and students disrespecting teachers. The teachers try these submissive ways of disciplining and it doesn't work. I think homeschooling in Finland would be a great idea. This way you can also keep your children from being brainwashed and engineered to be a certain way.
(If you don't need two breadwinners in the family, there's no reason to have both parents at work, unless it is to earn extra money for travelling or something In my opinion, of course!