She's already damaging the parent/child relationship herself. She's abusing her maternal authority and forcing her own kids to be political tools. Young children don't have the mental capacity to meaningfully consent to such political activities, especially when parental pressure is involved. Senator Cassidy is just calling her bullshit and letting the poor kids know he's got their back.
No one uses term "fascist" correctly anymore. It had specific political and economic meanings, and was supposed to be neutral of all value judgements, but now it's just an empty slur. There are actually lots of fascist elements in our modern governments, but no one ever calls them fascist because the word's meaning has now shifted to simply being "bad government".