What is the evidentiary requirement for establishing lineage through acknowledgment?

Primary text

Lineage is a right established through acknowledgment, and therefore, the number of acknowledging parties should not be restricted, similar to the establishment of debt through acknowledgment. Furthermore, since lineage can be established by a statement where righteousness (adalah) is not a prerequisite, the number of declarants should not be restricted, just as is the case with the acknowledgment made by the deceased person. Analogizing lineage establishment to legal testimony is invalid because testimony does not require specific phrasing nor righteousness (adalah), and testimony is nullified by acknowledging a debt.