He is married to Christina 4th Countess of Buchan Stewart.
They got married
Child(ren):
Robert Douglas<br>Gender: Male<br>Birth: 1542 - Lochleven Castle, Dumfries-shire, Scotland<br>Death: Aug 18 1580 - Drum, Aberdeenshire, Scotland<br&;gt;Father: Sir Robert Douglas<br>Mother: Lady Margaret Douglas (born Erskine)
www.wikitree.com
Robert Earl of Buchan Douglas<br>Gender: Male<br>Birth: 1543 - Castle, Dumfries-Shire, Scotland<br>Marriage: Christina 4Th Countess of Buchan Stewart1568 Scotlandt;a>Margaret Erskine<br>Child: Elizabeth Douglas<br>Notes: http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=27313599&pid=10829&;lt;br>Source: View the original record on GenealogieOnline website<br>Source Remarks: Some family trees were posted years ago and have later been removed. In such cases, the link to the original record will not work.
Added by confirming a Smart Match
MyHeritage family tree
Family site: Watson Web Site
Family tree: 72003901-1