Bowes was the illegitimate son of John Bowes the 10th Earl of Strathmore, and Kinghorne.
Aside from the Earldoms, the Earl holds the subsidiary titles: Viscount Lyon (created 1677), Lord Glamis, Tannadyce, Sidlaw and Strathdichtie (1677), Lord Lyon and Glamis (1606), Lord Glamis (1445) and Baron Bowes (1887) of Streatlam Castle, in the County of Durham, and of Lunedale, in the County of York.
James Earl Jones | Prince Edward, Earl of Wessex | Louis Mountbatten, 1st Earl Mountbatten of Burma | Herbert Kitchener, 1st Earl Kitchener | Earl | Frederick Roberts, 1st Earl Roberts | Earl of Derby | Earl Warren | Earl of Pembroke | Robert Harley, 1st Earl of Oxford and Earl Mortimer | Earl of Warwick | Thomas Wentworth, 1st Earl of Strafford | Edward Smith-Stanley, 14th Earl of Derby | Earl of Shrewsbury | William Pitt, 1st Earl of Chatham | Simon de Montfort, 6th Earl of Leicester | Richard Neville, 16th Earl of Warwick | Earl of Leicester | John Scott, 1st Earl of Eldon | Robert Devereux, 2nd Earl of Essex | Robert, 1st Earl of Gloucester | Edward Harley, 2nd Earl of Oxford and Earl Mortimer | Earl of Devon | Douglas Haig, 1st Earl Haig | My Name Is Earl | Edward Hyde, 1st Earl of Clarendon | Earl Scruggs | Earl of March | Richard Howe, 1st Earl Howe | John Russell, 1st Earl Russell |
Their granddaughter, another Mildred Porteus, married Robert Hodgson, of Congleton, and was the grandmother of Henrietta Mildred Hodgson (1805-1891), whose daughter Frances married Claude Bowes-Lyon, later Earl of Strathmore and Kinghorne and became the grandmother of Queen Elizabeth II.
1865–1904 – Claude Bowes-Lyon, 13th Earl of Strathmore and Kinghorne
1846–1865 – Thomas Lyon-Bowes, 12th Earl of Strathmore and Kinghorne