If Biden and his son is investigated and found doing something illegal, yes they should go to prison. Right now, there is no indictment/trial/etc.
That being said. I want to make it clear: there is something different between WRONG and ILLEGAL. What Biden and his son shows is that politics in America is wrong. It shows that names and connections can get you jobs that you could be unqualified for and that is WRONG. This is way too common in politics in America, and it needs to be fixed across the board.
Is what they did illegal? probably not. Is it wrong? Yes.
Now... This common practice in America is prevalent more than ever in the Trump administration. You CANNOT say what Biden/son did is wrong and NOT say that Trump has done nothing wrong. Trump has done far more wrong things in his past 3 years than I can reasonably count.
You have to understand degrees of wrongdoing as well. Some will say (Repubs?) that both sides are equal. WRONG. Trump has committed far worse and far many more wrong doings than Biden. Does that mean Biden gets off the hook? No.
TLDR:
Biden and Son? Wrong but probably not illegal
Trump? Far more Wrong in so many more ways. So why compare apples to a shitstain of an orange president?