How ungrateful the son can be, once he's distanced himself from his family.

"I can't believe we have such an ungrateful son!"

But he was unable to enjoy it because, at the same time, he felt too much like a thoughtless and ungrateful son.

I apologize to you, Father, for having been such an ungrateful son.

They could only see an obdurate, ungrateful son, old enough to know better, selfishly concerned with his own desires and no one else's.

And let me tell you what I have in mind for our special, gifted, ungrateful son.