take into one's family; "They adopted two children from Nicaragua"
take up and practice as one's own
choose and follow; as of theories, ideas, policies, strategies or plans; "She followed the feminist movement"; "The candidate espouses Republican ideals"
based on custom rather than documentation; "an unwritten law"; "rites...so ancient that they well might have had their unwritten origins in Aurignacian times"- J.L.T.C.Spence