Where do all members of a lineage group claimed descent from?

All members of a lineage group claim descent from a common ancestor, which can be a single individual or a set of related ancestors. This shared ancestry often serves to strengthen social bonds and identity within the group. Lineage can be traced through various means, such as patrilineal or matrilineal descent, depending on cultural practices. The concept of a common ancestor reinforces the group's lineage and heritage across generations.