There are several synonyms for the phrase "being one family" that can be used to describe a close-knit group or community. One synonym is "unity," which implies a sense of togetherness and working together towards a common goal. Another synonym is "solidarity," which suggests a strong sense of support and loyalty among members of a group. "Harmony" is another synonym that implies a peaceful and cooperative relationship between individuals or groups. "Fellowship" is also a synonym that many use to indicate a strong bond of friendship and camaraderie among people. Overall, these synonyms all suggest a deep and meaningful connection between individuals who are united by a shared purpose or goal.