noise that Pence could go down with him, but... The Republican senate, though, would almost certainly avoid having a Republican president make huge history by going to prison.
Also, Rump could probably mount a defense based on mental disorder. Many professionals have stated he is clinically diagnosable.
My best guess, in fact, has been that he would be removed under the 25th Amendment, avoiding criminal trial either voluntarily, by making a deal to resign, or involuntarily.
Section 3. Whenever the President transmits to the President pro tempore of the Senate and the Speaker of the House of Representatives his written declaration that he is unable to discharge the powers and duties of his office, and until he transmits to them a written declaration to the contrary, such powers and duties shall be discharged by the Vice President as Acting President.
Section 4. Whenever the Vice President and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide, transmit to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office, the Vice President shall immediately assume the powers and duties of the office as Acting President.
As for blanket pardons for everyone, it would be critically important for the Republicans to differentiate themselves from Rump's crowd by putting on a display of "seeking justice" and punishing the worst, mostly highly publicized. Some around Rum pare going to prison, and it could be that he wouldn't be in any position to negotiate pardons for his whole family, even if Kushner's crimes, for instance, weren't as extremely serious and unsweepable as they're starting to look.