Political divisions are increasingly stronger than family bonds

Donald Trump is out of office. His impeachment is over. And he’s been blocked by social media platforms. But even in his relative silence, he’s still a wedge issue between some family members — perhaps even more so given the events of his final weeks in office.

The hazard seems even greater if your job is to engage in politics.

Some relatives of Rep. Adam Kinzinger (R.-Ill.) wrote a letter to him after he voted to impeach Trump that illustrates this, in scathing terms. The note, which the New York...