Do others have recourse from thieving executor?

My husband's sister was named as executor of her estate. She received life insurance money to be divided evenly between 7 children. She told us she sent the money out (regular post) over a week ago, but no one has received any check yet. When asked, she stated she didn't know anything about it, presumably talking about why we didn't get a check. The rest of the brothers think she may have kept the money. Since it isn't a lot of money (about 500 each), is there recourse without bringing a lawyer into it? Maybe have her arrested for theft?