This led us to Wikipedia pages on Succession to the British Throne and the current Line of succession.
There are 1275 (!) people listed. Number 1275 is "Franziska Wassmann (b.1989), daughter of Countess Friederike-Christiane of Castell-Castell". Franziska has a whole bunch of deceit and treachery ahead of her before she can get to be Number One. Hopefully she has other interests.