How do we stop the Queen from protecting her son so that her son can be questioned by the FBI over paedophile claims?

The FBI has no jurisdiction to question anyone in a foreign country.

This is up to Andrew to decide, not mommy.

"We" who are we? If you mean America, they have zero power over a British citizen regardless of who he is and you can be 100% sure the Queen is not "protecting her son" any more than any other mother would.

He will have the best legal advice and 'if' there is "powerful evidence" then America can ask the UK  police to question him and/or to extrodite him to the USA.... as the USA protect US citizens who committed 100% proved murder in the UK and 'escaped' back to the US before being charged and refuse any extodition it seems unlikely the UK will complie with any US request on this one..... and the reality is regardless of what your US media  tells you can be sure the Queen is not stopping anything, she doesn't have that power, (but UK law does)...... what is stopping it is US politics and US lack of abiding by the law, US citizens jumping on the band wagon of what they read in their media they believe and that ANYONE is guilty if 'they' think they are.

HRH would never get involved in something like this.  Whether Andrew agrees to be questioned or not is up to him.  I'm sure he is getting good legal advice.  As US has refused to allow us to interview Anne Sacoolas over the murder of Harry Dunn, I would not hold your breath.

You shouldn’t, since you would just be found guilty of helping cover up or hide a pedophile.