Emancipatio

"EMANCIPA′TIO was an act by which the patria potestas was dissolved in the lifetime of the parent, and it was so called because it was in the form of a sale (mancipatio). By the Twelve Tables it was necessary that a son should be sold three times in order to be released from the paternal power, or to be sui juris. In the case of daughters and grandchildren, one sale was sufficient." Article by George Long, M.A., Fellow of Trinity College on pp455‑456 of William Smith, D.C.L., LL.D.:

See call no man Father