"Solidary" was the word I tried to find, but I did not find it in the dictionaries in which I looked it up (including some other Oxford online dictionary).
Does it make sense to you if you hear "a solidary family," "a solidary friend" or "solidary colleagues," meaning that they show solidarity to other members of the group they belong to?
And can I say that family members/colleagues are "cohesive" or that a family is "cohesive"? I know how to use cohesive in other contexts (like a cohesive community, society, nation, team, unit, force...), but I'm not sure if I can use it like this.