When my mom (who was so scared of water
she wouldn't put too much water
in the bathtub) found out we were taking our 10 year old son out of school
she didn't speak to us for 4 months.
We actually got a lot done while she wasn't speaking to us ;-} We prepared too much, bought too much, and brought too much......
Most people spend so much time preparing they never leave the dock
. We did eventually leave, cruised off and on for several years and continue to do so episodically.
Our son was 10 when we moved aboard and 15 when he started a land based school
again.He did not drown as my mother predicted, and he went on to graduate from HS in 3 years, attend a prestigious college, graduated in 3 years and now is doing better than 90% of his peers. Sailing made him a better child, person and man. It made and continues to make my husband and I very happy.
It's not the life for everyone, but you'll never know unless you try it, and if don't do it you'll always wonder if you should have.
No apologies, no explanations, just let them know you are living your dream
Best of Luck!