What do the Duke of Manchester, the Duke of Montrose, the Earl of Gosford, the Earl of Halifax, the Earl of Derby, the Earl of Tankerville, and the Earl of Dalhousie all have in common? They all descend from Richard Cecil... but, the descent I've tracked in which they are all blood cousins, all comes through George Montagu, 6th Duke of /Manchester/. Not their full descent from Cecil, nor their full royal descent, just the one that makes them all cousins.
Both George Montagu and his wife Millicent Sparrow are 12 generation descendents from the Scottish throne. Leo is not showing that Millicent Sparrow's father is also of royal descent and also descends from the Cromwell family of Hinchinbrook