As a dutiful son I carried out her last wishes, to the letter.

Being the dutiful son, he listened and left it alone.

He looked after his father, like a dutiful son should.

"But she can't stop me from being a dutiful son!"

"My feelings toward you are those of a loving and dutiful son."

He was, apparently, a dutiful son and the mother a source of much distress to him.

He would go with his father, yes, and present the appearance of a dutiful son.

In my country, a dutiful son is expected to take care of his parents when they are old.

"I was a very dutiful and good son," he said.

The dutiful son increased his visits to three a year.