Over the past five years, Robyn Sweet became more concerned as her father became immersed in far-right conspiracy theories.
Then she saw the picture of him in handcuffs inside the US Capitol building on 6 January.
Douglas Sweet declined to be interviewed by the BBC.
He is one of hundreds of pro-Trump protesters who stormed the US Capitol four months ago. We look at how many people have been arrested, and ask what punishment they might face.
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L'informazione della testata giornalistica di LA7 diretta da Enrico Mentana