[saiya-jin]

> I haven't told either of them though, because I know it will break their hearts.

Are you sure you are doing what's best in this situation and not just shying away from potential confrontation with them? Projecting their reaction which can be far from reality? In my 40+ years of experience with this thing called life I've always ended up with same conclusion - truth deserves to be told, even if its not pleasant. Also, truth will always find its way.

Some people will go to ridiculous lengths and suffering to avoid confrontation with truth, because 1000 small cuts seem less hurtful than 1 larger one and uncertainty it brings. Showing a proper respect and telling hard truth is appreciated by many folks though. Realizing your own child was bullshitting you for decades because of avoiding telling the truth which is anyway inescapable may hurt much more than actual topic in discussion.