close-knit /ˌkləʊs ˈnɪt◂ $ ˌkloʊs-/ (also ˌclosely-ˈknit) adjective
a close-knit group of people is one in which everyone knows each other well and gives each other support when they need it:
a close-knit community

[TahlilGaran] Dictionary of Contemporary English ▲

close knit
adj. Closely joined together by ties of love, friendship, or common interest; close.
The Joneses are a close-knit family.
The three boys are always together. They form a very close-knit group.

[TahlilGaran] English Idioms Dictionary ▲