This is abnormal?
It would be abnormal if FDR were running for his 22nd term.
In his time it was legal to serve multiple terms.
Of course mortality plays its independant role in history.
If there was a tweet order of succesion would we be looking at Kushner or Don Jr.?   

But enough hypotheticals.

In Bill Clinton's 1st term people thought it was abnormal to put Hillary in charge of revolutionizing Health Care. Marriage rights is greater than the Constitution??
The precedent was JFK hiring his brother as AG. Nepotisim was OK said JFK.
But marriage? A full blown war against Hillary began back then in earnest and went over the top. These days the war is a habit like a feud.
Now you know when it started.