Scenario, husband and wife purchase a house together. Neither has a will. Husband passes and wife just assumes since she lives in Texas, a community property state, everything is fine. Wife decides she wants to sell the house and discovers that she can't because nothing was done as it pertains to her deceased husband's half of the property. Title company asks for an affidavit of heirship, a document that outlines the deceased husband's genealogy. 

Through that document, it is determined that deceased husband had children from a previous marriage. Under the Texas statue, those children have an interest in the property that the surviving wife thought was all hers.  

Lets make matters worse, what if children don't like surviving wife and insists on some type of financial consideration in order to sign the deed. Or, what if surviving wife has no idea where one of the children is located or what if one of the children is also deceased. All scenarios that happen way too often. 

Lesson, you may think you don't have enough assets to need a will. Don't take that chance. Have wills drafted. They could save you a lot of time and money in the future.