“son should not be khalifa after father”
In a speech at the December 1914 annual Jalsa, the first Jalsa after Mirza Mahmud Ahmad became khalifa, he declared:
The above extract carries the heading Has the khilafat become a hereditary seat?, and under it Mirza Mahmud Ahmad says:
“Foolish is he who says that a hereditary seat has been established. I say to such a one on sworn oath: I do not even consider it allowable that the son should succeed the father as khalifa. Of course, if God makes him His appointed one, then that is a different matter. Like Hazrat Umar, I also believe that the son should not be khalifa after the father.” (p. 171)
See the speech at this link.
Everyone can see what happened subsequently in the history of this khilafat.
From Abdul Momin:
I could not connect to the above link.
By a remarkable “coincidence” it seems God has appointed a son of the ruling family a Caliph on every occasion there was a vacancy. He must have “liked” Khalifa II’s “objectivity” during his speech so much that he decided to reward his family with a perpetual khilafat.