This is a family tree that I roughed up from information contained in the book "The Caldwell's of Castle Caldwell" I am indebted to John B Cunningham who is the author and copyright holder of the book. It is far from complete and may contain inaccuracies but I am placing it on the site for such help as it may give to researchers. My ancestors came from the Prestwick area in Ayrshire but I doubt if we are connected as a family. John may care to save this for me into the searcheable archive area (thanks).
Key
v = issue
* = no further descendents recorded

William C of Straiton, Ayrshire
v
John C of Enniskillen (prior 1630) b Prestwick
m (1) Janet Grier
v
John (last heard of in Dublin 19.2.1639)
m (2) Mary Swetenham 2nd Daughter of Anthony S of Shadwick, Cheshire
v
(1) James of Enniskillen then Drumbury then Lisgoole d 1716 aged 87 (baronet 23.6.1683) then of Wellsborough (Rossbeg)
m Catherine Campbell d of Campbell of Skeldon
other children whose continuing lines are not recorded
v (children of (1))
(1) Mary m Matthew Cathcart of Tullyscanlan*
(2) Elizabeth died young*
(3) Frances m Edward Archdale of Castle Archdale*
(4) Jane m James Johnston of Magheramena
(5) Edith m Col Charles Newcomen of Co Longford* (might be a mistake)
(6) John d young in reign of Charles II in London*
(7) Charles of Ballyshannon attainted by Parliament @ Dublin 1689 died in reign of William in London*
(8) Henry m Catherine Hume 3rd Daughter of Sir John Hume of Castle Hume Co Fermanagh & North Berwick (sister of Anne Hume) - their children are listed below v
(9) Hugh was at siege of Donegal d 1710 at siege of Mons
m (1) Catherine White nee Shee*
m (2) Anne Hume*
(all the above sons were in the army)

v
Children of Henry & Catherine Hume
(1) Sir James 3rd Bnt d 18.12.1853 (?)
m Elizabeth Hort (d 1778) Daughter of Josiah Hort Lord Archbishop of Tuan
v their children are listed below v
(2) John Lt Col 8th Regiment of Foot d 31.10.1762 at Niagara*
(3) Hume d 19.8.1762 at Siege of Schweidnitz aged 27*
(4) Henry Capt 36 regt in Quebec m Anne Hamilton Daughter of Alexander Hamilton of Hampton Cty Dublin v
>
(5) Charles aide-de-camp to General Wolfe d 1776 (married & had children but no details)*
(6) Frederick Lt Gen in Portuguese service m & settled in Brazil - nothing more known*
(7) Anne m francois de Valangin (was in Cty Durham in 1775) had one child*
(8) Catherine b 1728/32 d 19.7.1780
m Samuel Bagshawe of Ford Hall Derbyshire 25.3.1751
>

Family of Sir James & Elizabeth Hort
(1) Sir John d 1830
m Harriett Maynell of Bradley Cty Derby
their children are listed below v
(2) Fitzmaurice d 16.3.1830
m Hannah Saunders*
(3) Josiah John d young*
(4) Mary Anne d 14.12.1841
m Armour earl of Belmore*
(5) Emily d 1840*
(6) Elizabeth Frances d 1845 not married*
(7) Arabella*

childen of Sir John & Harriett Meynell v
(1) Frances Arabella d 1872
m John Colpoys Bloomfield of Redwood Cty Tipparary 11.6.1817*
(2) Harriett d young*
(3) Louisa Georgina
m Sir Josiah William Hort of Hortland Cty Kildare and Castle Strange Middlesex 31.3.1823
v
Sir William Fitzmaurice Josiah Hort

The Caldwell's of Castle Caldwell seem to have had Scots origins and in the early days seemedto marry into families with Scots surnames but increasingly looked to England and married into English families. They appear to have adopted the Anglican religion and several members of the family were very acquisitive in obtaining grants of land.