{s} not a family member, not connected by kinship; not relevant, not pertinent; unconnected, unassociated
If one person is unrelated to another, they are not members of the same family. You can also say that two people are unrelated. Jimmy is adopted and thus unrelated to Beth by blood. related
If one thing is unrelated to another, there is no connection between them. You can also say that two things are unrelated. My line of work is entirely unrelated to politics Two of them died from apparently unrelated causes. = unconnected related