Hunter Biden was involved in criminal activities. He knew he was because he asked his accountant to tell him what his income would be if he was in jail. It’s probable that his father, VP Biden, knew this as well.
Hunter Biden’s accountant Eric Schwerin sent Hunter a reply to how much income he could expect to make in 2017 even if he had to go to jail. Schwerin responded that Hunter could conservatively estimate around $750,000 annually, even if he went to jail:
All of that money should go back into the system to replenish social security. Ill gotten gains put to a good use.