The phrase "were one of family" can be expressed in numerous ways depending on the context and the exact meaning one wishes to convey. Some synonyms for this phrase include "we were like kin," "we were close like siblings," "we were inseparable," "we shared a familial bond," and "we were like one big happy family." Each of these variations conveys a different nuance of closeness and familiarity between the individuals involved. It is important to choose the right synonym based on the intended tone and relationship dynamics being described.