Ie seido was a family system, which was introduced to the Civil Codes established in 1898 (hereunder referred as Old Civil Codes), under the system, a small group consisting of relatives and living in a house is considered as a family and a family has a family head who was given an authority to lead a family.
家制度（いえせいど）とは、に制定された民法（以降、旧民法という）において採用された家族制度であり、親族関係のある者のうち更に狭い範囲の者を、戸主と家族として一つの家に属させ、戸主に家の統率権限を与えていた制度である。