immediate relative:
In immigration law, a spouse, parent, widow(er), or unmarried child under the age of 21 of a U.S. citizen. For parents of a U.S. citizen, the petitioning child must be at least 21 years old.
relative:
a person connected with another by blood, marriage, etc.; kinsman or kinswoman
kinship:
Kinship is a relationship between any entities that share a genealogical origin, through either biological, cultural, or historical descent. In anthropology the kinship system includes people related both by descent and marriage, while usage in biology includes descent and mating. ...
so i suppose other relative = relative - immediate relative