Notes:

Titles:
Governor of Edinburgh Castle 1573-
Lord Provest of the Royal Burgh and City of Edinburgh 1576

If this is the George DOUGLAS, father of Christian (see source), then his wife may be Elizabeth DOUGLAS. If not the correct father of Christian, then wife is unknown.

http://celticcousins.homestead.com/Edinburghrovests.html
1576 George Douglas of Parkhead (Lord Provest of the Royal Burgh and City of Edinburgh 1576)

http://www.alphalink.com.au/~kincaid/Hall/govlist.htm
1573 Sir George Douglas of Parkhead
Sir George Douglas of Parkhead and Todholes

http://www.clansinclairusa.org/clansinclairold/6_Chart_Rosslyn_StClairs.htm
Edward, 15th Baron of Rosslyn
m. Christian, d/o George Douglas of Parkhead, Gov. of Edinburgh Castle but had no issue
so his brother, Sir William of Pentland became next Earl

George married Elizabeth (of Parkhead) Douglas about 1568 in Parkhead, Lanarkshire, Scotland. [Group Sheet] [Family Chart]

1. Martha Douglas was born before 1590; and died.
2. Sir James (of Parkhead) Douglas died on 14 Jul 1608 in High Street, Edinburgh, Midlothian, Scotland; was buried in chapel of Holyrood.
3. Sir George (of Mordington) Douglas and died.
4. John Douglas, DD
5. Katherine Douglas and died.

Notes:

Titles:
Master of Morton
4th Earl of Morton 1542-1567
Regent of Scotland

For some time, as a child, James was known as James INNES.
[ancestry.com]
Great Britain, Portraits of Illustrious Personages, 1502-1852 Illustrious Personages of Great Britain, with Biographical and Historical Memoirs, Vol. 2 James Douglas, Fourth Earl of Morton.
"...He was trusted to the care {James} of a trusty person of inferior rank; Assumed the name of INNES; and as he approached manhooh...

Buried:
He was executed on the 2nd of June 1581. . His corpse remained on the Scaffold for the following day, until it was taken for burial in a Common grave at Greyfriars Kirkyard. His head however remained on a spike outside the Tolbooth of Edinburgh for eighteen months until it was ordered to be reunited with his body in December 1582.

Although Morton's final resting place is allegedly marked with a small sandstone post incised only with the initials "J.E.M." for James Earl of Morton, this is simply a Victorian marker for a lair edge, twisted in meaning for convenience. Logically, were a marker allowed (which was not permitted for executed criminals) firstly it would more logically read "J.D.", and secondly it would have been cleared away in 1595 when all stones were removed from Greyfriars.

James married (Mistress) Cullen before Apr 1572 in Not Married.. (Mistress) and died. [Group Sheet] [Family Chart]

Notes:

These children may not be the children of Ms. Cullen.

George + Elizabeth (of Morton) Douglas. Elizabeth (daughter of David (of Pittendreich) Douglas, daughter of James (3rd Earl of Morton) Douglas and Princess Catherine Stewart) and died. [Group Sheet] [Family Chart]

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

James married Princess Catherine Stewart before 10 Dec 1507. Catherine (daughter of James IV Stewart King of Scotland and Margaret \ Mary (Marion) (of Bonshaw) Boyd) died after 5 Jul 1554. [Group Sheet] [Family Chart]