Filiation means figuring out who your mommy and daddy are. When someone is born, they usually get a mommy and a daddy, but sometimes it's not clear who the daddy or mommy is. To figure it out, people might use things like DNA testing. This tells you if the mommy or daddy is related to you by something called "genes." It's like a special code that makes you who you are. Figuring out filiation is important because it helps make sure everyone knows who their family is and can get the things they need from them, like love and support.