Did the birth of Husayn add something to Hasan?

Did the birth of Husayn add something to Hasan? Did Hasan find a thing called "brotherhood" which he did not have in his existence? Hasan did not change at all. But when another son was born to Hasan's parents, you extracted from this incident a concept which you called "brotherhood". Such are the annexed concepts - they are concepts that come true between two things, without adding anything to either of…