If the inheritance from an intestate passes to the collateral kindred of the intestate and part of the collateral kindred are of whole blood and the other part are of half blood of the intestate, each of the collateral kindred who is of half blood inherits only half as much as that inherited by each of the collateral kindred who is of whole blood. If all of the collateral kindred are of half blood of the intestate, each of the collateral kindred inherits a whole portion.