What you will find in this packet: • Petition for Probate (DE-111). Read up on articles about estate planning and probate topics in the Contra Costa Lawyer magazine.Sign up for this section today. Take advantage of letters, forms, worksheets, a significant date list, and a checkplan, all designed to take you through a probate matter from beginning to end. This set provides coverage of every aspect of probate law and estate and trust administration in Texas. With this service you will be able to submit completed forms electronically to the Contra Costa County Department of Child Support Services. Key Takeaways: When is Probate Necessary in Contra Costa County? Inheritance and Estate Distribution; Validity of Wills and Trusts. Key Takeaways: When is Probate Necessary in Contra Costa County? Inheritance and Estate Distribution; Validity of Wills and Trusts.