To be fair, Lois was mad that Lex never divulged that he'd been married before, not about the way his estate was being divvied up. Besides, why would Lois assume she was entitled to any money/property/stocks? She was never married to him, nor should she have anticipated that he would have already changed any preexisting wills to include her before any "I Dos" were exchanged.
We also know that he actually DID set aside money Lois could have accessed, if she'd known about it (another secret he kept from her), during the whole amnesia-clone arc when he takes her to the back to withdraw the millions, so he would no longer be flat broke.
As for his sons, we know Jaxon worked for Lex but Lex never acknowledged him as his son, publicly. In fact, Lex told Lois that he had a child but that the boy and his mother were killed in an accident. Chances are very good Jaxon never would have seen an inheritance. And as for the other son, he used Leslie Luckabee to stand in for him as Lex Luthor Jr. Now, he got the Lex name, but because he wasn't born to Lex's wife and because of his disfigurement, my money is, again, on him receiving exactly nothing in a will. (Note: Leslie spins a tale about what it was like having his "rich, famous" father, but as his whole story/identity as Lex Jr is a lie, we can discredit that story as a lie as well.)
