Notes:

It is not at all certain that she was Patrick's mother

Margaret married Sir James (7th Baron of Drumlanrig) Douglas in 1513. James (son of Sir William (6th Baron of Drumlanrig) Douglas and Elizabeth (of Lochinvar) Gordon) died in 1578. [Group Sheet] [Family Chart]

1. Janet Douglas and died.
2. Margaret Douglas and died.
3. Nicholas (Or Nicholace) (of Drumlanrig) Douglas and died.
4. Patrick (Bailie of Morton Castle) Douglas was born in Drumlanrig, Dumfriesshire, Scotland; died in 1570.

George married Elizabeth Drummond in 1488. Elizabeth (daughter of John 1st Lord Drummond and Elizabeth (of Crawford) Lindsay) and died. [Group Sheet] [Family Chart]

Notes:

Son of the fourth Earl. Known as the Great Earl of Angus, and as "Bell the Cat". He was married three times, had three sons, and several daughters. His second son, William, was by Elizabeth Boyd. The name "Bell the Cat" came to Angus through an occurrence at the time of Cochran, Minister to James III. A secret meeting of some nobles was held when the corruptions of Cochran were discussed, and a method of overcoming the evils. Lord Gray told a fable.
"A council held by the mice, who were much annoyed by the cat, decided that a bell should be hung around puss's neck to warn them when she was coming. But although all were in layout, no one could be found with sufficient courage to place the bell on the cat."
Thus, it was insinuated that although the nobles might condemn the King's Minister, there was no one to be found with the courage to carry out their resolutions. At this Angus arose and said; "I am he who shall bell the cat." While still debating, a loud knocking sounded at the door, and Cochran with three hundred men appeared. Angus met him, and seizing a rich gold chain which Cochran wore around his neck, jerked it off, saying "A halter would be more becoming."
So, they hanged him with many others, and thus "Bell the Cat" got his name.
Angus, at this time was the leader of the Scottish nobility and on the seizing of the King by the nobles, Angus it was who dictated the terms of his release to Albany, the king's brother; and being so fair and reasonable, he gained the respect of the King and Court, Albany was for a time practically ruler of Scotland, until he showed favoritism to the English, when the nobles became suspicious, and he had to flee the country. He then attacked Scotland with the English. Angus was nearly captured in the fight, escaping only by speed of his horse.
Earl Angus was at once Warden of the East and Middle Marches, Lord of Liddesdale and Jedwood Forest, and possessor of the Castles of Douglas, Hermitage and Tantallion. He was highly esteemed by the nobility, and the faction, which he controlled, shook the throne of James III, whose person they restrained. In 1488, Angus and his supporters made war on the King, who was defeated at Bannockburn. The King, fleeing the field, was murdered, after a fall from his horse.
During the early reign of King James IV, Angus was an advisor and friend of the young King, who at the same time, kept a close watch on the growing power of Angus, and later forced Angus to exchange his castle of Hermitage in Galloway for the Castle of Bothwell, thus scattering his strength.
In 1513, an English army, under the Earl of Surrey, met the Scottish army at Flodden. Here Earl Angus tried to advise the King as to the procedure of Battle, but being insulted by the King who had turned very stubborn, the old Knight retired from the field, leaving his two sons who were killed, with the King in the battle the next day. Angus died the following year, a very old man, and was succeeded by the son of his eldest son, George Master of Douglas, who was killed at Flodden. (See Scott's Marmion)

Archibald married Elizabeth Boyd on 4 Mar 1467-1468. Elizabeth (daughter of Robert (Great Chamderlain) 1st Lord Boyd and Mariot (of Calderwood) Maxwell) died before 21 Feb 1497. [Group Sheet] [Family Chart]

John + Elizabeth (of Crawford) Lindsay. Elizabeth (daughter of Alexander (4th Earl of Crawford) Lindsay and Margaret Dunbar) was born about 1448; died after 22 Sep 1519. [Group Sheet] [Family Chart]

Notes:

Brother of second Earl and Uncle of third Earl. Married.Took part with the King of Scotland against the ninth Earl of Douglas in 1454, and was rewarded with a grant of Douglasdale.
So the Angus branch, as we see, came back into a large part of the inheritance which should have gone to the 1st Earl of Angus as the direct descendant of the 1st Earl of Douglas, rather that to Archibald the Grim, the natural son of Sir James the Good. If this contention is correct, the Angus line is the direct Black Douglas line, as Sir William Fraser suggests.
At this time, the Angus line got the name of the Red Douglas from the complexion of the Earl. A splinter of the bursting cannon, which killed James II, wounded him.

Some sources have a son, Andrew Douglas of Bonjedward. This, however, must be an error.

Philip Nisbet of that ilk married (1) in November 1524, Mariota Hoppringill, daughter of the deceased William Hoppringill of Torwoodlie; and (2) Isobel, daughter of David Home of Wedderburn and his wife Alison Douglas, sister of Archibald (Bell-the-cat), fifth earl of Angus. The second alliance no doubt explains the assistance given by the Nisbets to the Douglases in the struggles of the latter with king James V. I cannot trace this Alison.

George married Isabel Sibbald before 1446. Isabel (daughter of John (Sir) (of Balgony) Sibbald) was born about 1418; died before 21 Feb 1497. [Group Sheet] [Family Chart]

Notes:

Some sources say her father was Sir Andrew Sibblad of Balgony

Robert + Mariot (of Calderwood) Maxwell. Mariot (daughter of Robert (Sir) (of Calderwood) Maxwell and Sibella (of Hyndford) Carmichael) died about 1473. [Group Sheet] [Family Chart]

Macolm married Mariot Murray in 1445. Mariot (daughter of David (Sir) (of Tullibardine) Murray and Margaret (of Luss) Colquhoun) and died. [Group Sheet] [Family Chart]

Alexander + Margaret Dunbar. Margaret (daughter of David (Sir) (of Cockburn) Dunbar) was born about 1425; died after 1496. [Group Sheet] [Family Chart]