Royal titles?

Damn! I've left my copy of DeBrett's at home...
I think he would revert to his original title and rank [as the Prince Consort is only as a result of marrying the Queen]. But I think he would still be called Prince/His Royal Highness as a courtesy...

 

I assume he would keep some sort of rank, unless he was hated. Especially if he were a noble prior to the marriage. If he were not a noble then they would likely have granted him a title beforehand, so maybe roll his title back to that one?

If that doesn't sound right, then maybe look at how folks treated monarchs that stepped down so their heir could take the throne.

Instead of the 'Queen Mother', he'd be the 'Prince Father' (that doesn't roll off the tongue very well, does it).

 

He could also retain his title if he was the only consort, even after the death of the queen and his son taking the throne, he could be 'Former Queen's Consort' or 'Late Queen's Consort'. Also some entitlement towards his relationship with his son's position could work. 'King's Father' or something similar.

 

My understanding is that if the current Queen of England were to pass (God forbid), that her husband would still retain the titles of Prince and Duke of Edinborough, and his lesser titles. I don't think your noble station or standing changes if your spouse passes.

 

Depending on the country the title the former ruler's spouse can either revert to their previous title or be at the discretion of the new ruler. The quality of care for the former consort can depend on how much the new ruler like them.