Child of Wanstead in the Baronetage of England (1678-1784)
Viscount Castlemaine of Castlemaine in the Peerage of Ireland (1718)
Earls Tylney of Castlemaine in the Peerage of Ireland (1731-1784)
Sir Josiah Child, 1st Baronet
- Sir Josiah Child, 1st Baronet (c. 1630–1699)
- Sir Josiah Child, 2nd Baronet (c. 1668–1704)
Earls Tylney
- Richard Child later Tylney, 1st Earl Tylney, 1st Viscount Castlemaine and Baron Newtown of Newtown, 3rd Baronet (1680–1750) He and his sons took the name of Tylney in place of that of Child by Act of Parliament in 1734 when his wife inherited the estates of that family.
- John Tylney, 2nd Earl Tylney (1712–1784)
Long, later Tylney-Long of Westminster in the Baronetage of England (1662-1805)
Tylney-Long of Westminster
- Sir Robert Long, 1st Baronet (1598-1673)
- Sir James Long, 2nd Baronet (1617-1692)
- Sir Robert Long, 3rd Baronet (1673-1692)
- Sir Giles Long, 4th Baronet (1675-1698)
- Sir James Long, 5th Baronet (1682-1729)
- Sir Robert Long, 6th Baronet (1705-1767) married Lady Emma, daughter of Richard Tylney, 1st Earl Tylney
- Sir James Tylney-Long, 7th Baronet (1736-1794)
- Sir James Tylney-Long, 8th Baronet (1794-1805)
Barons Mornington in the Peerage of Ireland (1746)
Earls of Mornington in the Peerage of Ireland (1760)
Barons Maryborough in the Peerage of Ireland (1821-1863)
- William Wellesley-Pole, 3rd Earl of Mornington, 1st Baron Maryborough (1763–1845), second son of Garret Wesley, 1st Earl of Mornington and in 1781, in accordance with the will William Pole (d.1781), of Ballyfin in Ireland, his godfather, he changed his name to Wesley-Pole. Pole was descended from Peryam Pole, 3rd son of Sir William Pole (1561-1635) and brother of Sir John Pole, 1st Baronet (c.1589-1658).
4th Earl of Mornington
- William Pole-Tylney-Long-Wellesley, 4th Earl of Mornington (1788–1857) assumed the additional surnames of Tylney-Long in 1812, upon his marriage with Catherine, daughter and co-heiress of Sir James Tylney-Long, 7th Baronet, of Draycot, Wiltshire.
- William Richard Arthur Pole-Tylney-Long-Wellesley, 5th Earl of Mornington (1813–1863)