Problem - 4636
$\textbf{Right to Marry}$
Can a man legally marry his widow's sister in the state of California?
$\textbf{Answer}$
No. Because this man is dead.
$\textbf{Analysis}$
This is a riddle. Pay attention to the word 'widow'. Whether it is in California or somewhere else is irrelevant.
$\textbf{Note}$
Brain teasers are not professional qualification tests. Therefore, it is not going to check specific laws in certain places. Do not fall into such traps.