i added the father and a brother -- and then a bunch of duplicates nearby showed up. I don't think the line is very well sourced other than names - I added the trees at Wikitree and FamilySearch, which if you follow back, the lineage doesn't make sense in terms of people's ages. The closest Geni goes right now is 13th cousins.
Capt. William King, Sr. (I) is Robert "Leal" King's 13th cousin once removed.
Robert "Leal" King → Elizabeth (Hill) King (his mother) → Mildred (Clopton) Hill (her mother) → William Clopton, III (her father) → William Clopton, Jr. (his father) → William Clopton, Gent., of St. Peter’s Parish (his father) → Rev. William Clopton (his father) → Walter Clopton, I (his father) → Margery (Waldegrave) Clopton (his mother) → Edward Waldegrave, of Borley, in Essex (her father) → Sir George Waldegrave, Kt. (his father) → Dame Margery Wentworth (his mother) → Elizabeth (Howard) Wentworth (her mother) → Margaret (Hussey) Howard (her mother) → Sir Henry Hussey, Kt. (her father) → Margaret de Verdun (his mother) → Sir Thomas Crophull, Kt. (her son) → Agnes (Crophull) Merbury (his daughter) → Sir Walter Devereux, Kt. (her son) → Sir Walter Devereux (his son) → Walter Devereux, 7th Baron Ferrers of Chartley, K.G. (his son) → Elizabeth (Devereux) Corbet (his daughter) → Sir Robert Corbet, of Moreton Corbet (her son) → Dorothy (Corbet) Mainwaring (his daughter) → Sir Arthur Mainwaring, Kt., MP (her son) → Blanche (Mainwaring) King (his daughter) → Capt. John King (her son) → Capt. Francis King (his son) → Robert King (his son) → Capt. William King, Sr. (I) (his son)