Credit to Gary Boyd Roberts, RD600:

Line of Descendancy from
King Henry VII of England to Cary Elwes

..1 King Henry VII of England (1457 - 1509)
.. + Princess Elizabeth Plantagenet (1465 - 1503)
....2 Mary Tudor (1496 - 1533)
.... + Sir Charles Brandon (1484 - 1545)
......3 Frances Brandon (1517 - 1559)
...... + Sir Henry Grey ( - 1554)
........4 Katherine Grey (1539 - 1568)
........ + Sir Edward Seymour (1539 - )
..........5 Sir Edward Beauchamp Seymour (1561 - 1612)
.......... + Honora Rogers
............6 Sir Francis Seymour (about 1590 - 1664)
............ + Frances Prynne
..............7 Sir Charles Seymour (1621 - 1665)
.............. + Elizabeth Alington
................8 Sir Charles Seymour (1662 - 1748)
................ + Elizabeth Percy (1666 - 1722)
..................9 Catherine Seymour (1697 - 1731)
.................. + William Wyndham (1687 - 1740)
....................10 Sir Charles Wyndham (1710 - 1763)
.................... + Alicia Maria Carpenter ( - 1794)
......................11 Elizabeth Alicia Maria Wyndham ( - 1826)
...................... + Sir Henry Herbert ( - 1811)
........................12 Frances Herbert
........................ + Sir Thomas Reynolds Moreton
..........................13 Mary Elizabeth Kitty Moreton (1798 - 1842)
.......................... + Sir William Basil Percy Feilding (1796 - 1865)
............................14 Sir Rudolph William Basil Feilding (1823 - 1892)
............................ + Mary Berkeley (1833 - 1901)
..............................15 Winifride Mary Elizabeth Feilding (1868 - 1959)
.............................. + Gervase Henry Cary-Elwes (1866 - 1921)
................................16 Simon Edmund Vincent Paul Cary-Elwes (1902 - 1975)
................................ + Gloria Elinor Rodd (1901 - 1975)
..................................17 Bede Evelyn Dominick Cary-Elwes (1931 - 1975)
.................................. + Tessa Georgina Kennedy
....................................18 Ivan Simon Cary Elwes