Legal Question in Wills and Trusts in Missouri

At the time of her death, unless her will said otherwise, your mother's assets were to be split between your stepfather and you. It is probably too late to open an estate for your mother. But, you might be able to file a Motion to Determination Heirship as to some of her asets. You might consutl directly with a probate attorney in yoru area. He can discuss yrou mother's assets with you to help you determine if any are worth pursuing.

Good luck