Ok, note that this is not in any way a condemnation of you or an endorsement of govt. tyranny.
Now here is the argument. You act as a tyrant towards your children because they are not competent to make their own decisions and you use force to accomplish this.
Now, how does the govt. know that a person is competent to make the correct decisions? If it believes that people are not competent is it justified in exercising tyranny?
I'm not saying you are not within your rights do raise your children as you see fit, but just to me it seems a little hypocritical. I don't know if you remember childhood but I do and children are not as dumb as you make out. Often smarter than a lot of adults albeit less experienced.
If liberty is to prevail in the political arena, first it must flourish in people's hearts. Use of force is not compatible with liberty.