If you plant more than one seed of a cross you end up with siblings or some call them sisters, normally one will out preform the others. In rare case's a hybridizer will register two from the same cross, normally not in same year but wait a year to register the second one. Of course about 95% of all seedlings will never make it to registration.
These are Tets
These are Dips
Here are two that was registered in the same year (2011)
LILLIAN'S VAPOR TRAIL
LILLIAN'S WHITE LIES
