I mean, basically the whole family is going to jail the moment their dad is out of office. We know it, and they know it. Trump himself has been sowing seeds to declare a loss illegitimate, and for years now he's occasionally joked that it'd be super cool for America to have a president for life like all the dictators he looks up to. So does anybody really think that in the event of a Biden win, Trump's gonna just give up the office without a fight and wait for the noose to tighten around his, and his children's, necks? There's gonna be a huge electoral fracas at the very least. There could be a lot of fash violence too. I don't really think it'll spark Civil War 2 by itself but it could certainly help. It seems to me like a lot of folks here talking about a Biden presidency are ignoring the minor hurdle of getting Trump to cede power in the first place.
Even if Trump refuses to leave the White House physically, he will no longer be president. The launch codes reset, the military chain of command reports to the new president and so does the secret service. Trump will bitch and moan a lot, and many of his followers will believe him, but his only chance of remaining in power would be for the military to actively decide not to follow the constitution.