He always follows the rules.

My grandfather always says 'Obey your children when you get old,' and respects our opinions.

When he immigrated to a new country, he remembered the proverb 'When in Rome, do as the Romans do' and tried to adapt to the culture of that country.

There is a proverb that says, 'When in Rome, do as the Romans do,' so let's follow the customs of Rome when we are there.