1) Accepted by vote 2) Adoptive 3) Assumed 4) Became legal guardian of 5) Embraced 6) Espoused 7) Gave a home to 8) Given a home 9) Got out of a shelter 10) Like a pet dog from a pound 11) Like many pets 12) Like Steve Jobs and Moses 13) Not a part of from the start 14) Not biological 15) Taken in 16) Taken into the clan 
• (a.) Taken by adoption; taken up as one`s own; as, an adopted son, citizen, country, word. • (imp. & p. p.) of Adopt
A·dopt'ed adjective Taken by adoption; taken up as one's own; as, an adopted son, citizen, country, word. -- 
[adj] - having been taken into a specific relationship 2. [adj] - acquired as your own by free choice
adjective having been taken into a specific relationship; `an adopted child`