I come from a close-knit family; we never keep secrets from one another.
A close-knit group of people are closely linked, do things together, and take an interest in each other. Events over the last year have created a close-knit community. a close-knit group of people is one in which everyone knows each other well and gives each other support when they need it
held together as by social or cultural ties; "a close-knit family"; "close-knit little villages"; "the group was closely knit