Succession takes place under an agreement as to succession, a will, or by operation of the law. One or more of these grounds for succession may exist side by side.
By law, an agreement as to succession is the most powerful title of succession, followed by a will. The legal sequence is followed only if the deceased has not drawn up a disposition of property upon death. This means that an agreement as to succession takes precedence over a will and the law, and a will takes precedence over the law.
Agreement as to succession
Will
Legal order of succession