There are various synonyms to describe the phrase "was one family" that can be used to convey the same meaning in different ways. For instance, "were akin" suggests that members of a group share some common traits or ancestry. "Were united" emphasizes the idea of togetherness and solidarity. "Were linked" could imply a close connection or bond between individuals. "Were bound" implies a sense of obligation or commitment to each other. "Were related" could suggest a family relationship or a sense of familiarity among members. Depending on the context and the desired tone, any of these alternative expressions could be used to convey the sense of a cohesive group that operates as one family.