Smallville, Season 5

Lionel:
What good is having a family if they don't watch out for each other?

Lex:
On the off chance that unshakable family loyalty fails, there's always those Luthor closets to rummage through.

Lionel:
All right, let's skip the prologue, Lex. What ancient skeleton do you think you've dug up this time?

Lex:
Well, it's not quite a skeleton yet. More like a freshly laid corpse... I wonder how Martha Kent would feel if she knew you had a secret meeting with her husband right before he died. Now, a transgression like that would test the virtues of even the most forgiving woman.