Eleven members of his family signed a letter hitting him for his vote last month to impeach the then-president, whom they supported as a Christian.
“Oh my, what a disappointment you are to us and to God!” they wrote, blaming Kinzinger for going “against your Christian principles” and joining the “devil’s army.”
"It is now most embarrassing to us that we are related to you," they added.
His relatives further sent the letter to other conservative lawmakers.
“We should listen to even more grievances against you, but decided you are not worth more of our time to list them,” the letter from his relatives proceeded. “You have embarrassed the Kinzinger family name!”
“We thought you were ‘smart’ enough to see how the left is brainwashing many ‘so called good people’ including yourself and many other GOP members,” the letter continued. “You have even fallen for their socialism ideals! So, so sad!
Kinzinger, one of 10 House Republicans who voted to impeach Trump last month, likewise voted this month to strip Rep. Majorie Taylor Greene, R-Ga., of her committee assignments for espousing conspiracy theories.
He’s risking his career on denying Trumpism, pushing for an alternative path for the GOP. He recently launched a "Country 1st" political action committee, which attempts to put some money behind the political effort facing a party largely still aligned with the former president.
"The reality is this — this is the time to choose," Kinzinger announced throughout an interview with NBC's "Meet the Press" on Jan. 31. "Let's take a look at the last four years: how far we have come in a bad way, how backward-looking we are, how much we peddle darkness and division. That's not the party I ever signed up for."
In the interview, he indicated at the letter, saying he'd got two certified letters "disowning me."
Kinzinger explained that the family members who sent the letter suffer from “brainwashing” from conservative churches.
“I hold nothing against them,’’ he said, “but I have zero desire or feel the need to reach out and repair that. That is 100 percent on them to reach out and repair, and quite honestly, I don’t care if they do or not.”
It's expected to be an uphill, lonely battle: Throughout the impeachment vote, Kinzinger asked Democrats for more speaking time to make a bipartisan pitch for the impeachment of Trump, according to the Times, though was rejected. Republican Rep. Liz Cheney of Wyoming voted to impeach Trump and only almost held on to her leadership position in the House when her party mounted an effort to strip her of it.