The UK Royal house so far has been seen as a solid institution (arguably). Baldrick/Tony Robinson made a great episode on where the lineage of the Plantagenets has some fascinating gaps.
And Spoiler for the Brits here who are panicking at the thought of weekly Barbies with Tim-Tams and XXXX beer being organized at Windsor castle? : Nah he rather stays up the bush 
Is This Australian Man The Real King Of England? | Britain’s Real Monarch | Timeline - YouTube