in the fifties uncle married - the wife became an aunt ( even tho not a blood relation )
1. first cousin once removed - agreed
so 2 and 3 are also 1
4 second cousin
spouse also second cousin unless you want to spend a hour specifying
and five - second cousin once removed ....
cousins I think are reflexive - if A is the cousin of B then B is the cousin of A - this is NOT the same as other family relationships- uncle-nephew etc ....