The BeeHolder, April 2011

The drone is a male bee.
He develops from an unfertilised egg.
He has a Mother but no Father.
He has but one Grandfather.
He cannot have sons but he can have daughters.
He may have grandsons.
Can he have granddaughters?

Don't be fooled into thinking that the information to answer the question is included in the riddle. Just enjoy the sensation of your brain writhing in discomfort.

An Hes, The Newsletter of the West Cornwall BKA