It takes an act of Parliament to strip Harry and his child.
That’s not correct.
Not sure where you got that piece of info at.
The Queen gives Titles, the Queen can remove Titles.
Parliament is not involved over the affairs of the Sovereign.
Also, the Queen does have a vote in Parliament, she has never used it.
The Queen has the right to over rule a Parliament vote but that power has never been used. About a 230 year old law.
The Conservatives have an solid majority in Parliament.
Unstoppable really.
They could do it if they want to.