There are no hard rules regarding the order to list surviving family members in an obituary. But you can start by including the closest relatives first. Start with the parents if they are to be included. Then the name of the spouse followed by the children and their spouses. List the children according to age. If there were ex-partners, especially if they had children, list them next. Then siblings, and lastly, any other close family members you would like to add. You can list them individually or group them together (use semicolons, like "spouse, [Name]; children, [Name] and [Name]; ...").