Is a man under the law of England?
What made him free of that law?
that is, to have the liberty to dispose of his actions and possessions according to his own will, within the permission of that law?
A capacity of knowing that law; which is supposed by that law, at the age of one and twenty years, and in some cases sooner.

If this made the father free, it shall make the son free too.

Till then we see the law allows the son to have no will, but he is to be guided by the will of his father or guardian, who is to understand for him.

And if the father die, and fail to substitute a deputy in his trust; if he hath not provided a tutor, to govern his son, during his minority, during his want of understanding, the law takes care to do it; some other must govern him, and be a will to him, till he hath attained to a state of freedom, and his understanding be fit to take the government of his will.

But after that, the father and son are equally free as much as tutor and pupil after nonage; equally subjects of the same law together, without any dominion left in the father over the life, liberty, or estate of his son, whether they be only in the state and under the law of nature, or under the positive laws of an established government.
Sect.60.But if, through defects that may happen out of the ordinary course of nature, any one comes not to such a degree of reason, wherein he might be supposed capable of knowing the law, and so living within the rules of it, he is never capable of being a free man, he is never let loose to the disposure of his own will (because he knows no bounds to it, has not understanding, its proper guide) but is continued under the tuition and government of others, all the time his own understanding is uncapable of that charge.