1)  Stump has become "annoyed" with Stump Jr's girlfriend.

 
2)  She has signed on to be a campaign aide for my former governor Eric Greitens, who's running for U.S. Senate in 2022.

 
3)  Greitens, a Con (of course), was forced to resign as Missouri's governor in 2018 over allegations of blackmail & sexual abuse.  A good, solid "family values" guy.  That's almost tame in comparison to insurrectionist Heil Hawley.

 
4)  Trumpolini is pissed because he believes Greitens will use Jr's girlfriend to sponge off her present ties with the Trumpolini name without getting his formal permission (or agreeing to pay him some name association royalties).  I can see Stump suing Greitens for infringing on his patented S.O.P.

Let them continue to eat their young, while I....

Serious Q about authorized management / signatories.  
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There are gov regulations about who can serve in management positions in publicly traded companies, gov regulated charities and non-profits. E.g., a convicted crook cannot be CEO of publicly traded company or run a hedge fund and so on. Trump and the kids were banned from serving on the board of any charity in NYS as result of their roles in the Trump Foundation fraud.  
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*** Serious Q: Are there any regulations regarding who can be a C-level official or a legal signatory of a PRIVATELY HELD company for business or tax purposes? ***
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E.g., every one of us here (I hope) can sign their own tax returns swearing that they are truthful.  Does a convicted felon have to get a second signature (e.g., accountant, spouse, priest, ...) to co-sign specific legal or financial documents?  Can a convicted felon with a private company sign legally binding contracts on behalf of his company?  (I'm pretty sure a convicted felon can probably sign a credit card charge slip but more complicated stuff with more far-reaching legal ramifications?)  
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When Trump is convicted of tax fraud (on his personal taxes and/or Trump Org private corp taxes), will he able to continue to be CEO of Trump Org? Will he be allowed to sign financial documents and contracts on behalf of Trump Org? Will Trump be allowed to sign his own incarceration papers or will someone have to co-sign for him?