A quick definition of order of filiation:

An order is a command or instruction given by a court or judge. It can be a written direction or a spoken one. There are different types of orders, such as a filiation order which determines paternity and child support, or a restraining order which prohibits someone from doing something. Orders can also be related to buying or selling stocks, where an investor gives instructions to a broker on how and when to buy or sell securities. Overall, an order is a way of directing someone to do something or to follow a certain course of action.