Children and parents in natural law

Here is the full context of the quotation Pastor Allen used from John Stott in last Sunday's message:

“Children, obey your parents..., for this is right.” Child obedience belongs to that realm which may be referred to as 'natural law'—the law which God has written on all human hearts (Rom.2:14-15). It is not confined to Israel's law or to Christian ethics; virtually all civilizations have regarded the recognition of parental authority as indispensable to a stable society. It is not surprising, therefore, that Paul includes 'disobedient to parents' as a mark both of a decadent society which God has given up to its own godlessness and of 'the last days' which began with the first coming of Christ (Rom.1:28-30; 2 Tim.3:1-2).