In Oct 1580 John Erskine 19th Earl Mar (age 18) and Anne Drummond Countess Mar (age 25) were married. He the son of John Erskine 18th Earl Mar.

In Dec 1592 John Erskine 19th Earl Mar (age 30) and Mary Stewart Countess Mar (age 10) were married. She by marriage Countess Mar. The difference in their ages was 20 years. She the daughter of Esme Stewart 1st Duke Lennox and Catherine Balsac Duchess Lennox. He the son of John Erskine 18th Earl Mar. They were third cousin once removed.

On 12 Oct 1609 [his son-in-law] William Keith 6th Earl Marischal (age 24) and [his daughter] Mary Erskine were married. She the daughter of John Erskine 19th Earl Mar (age 47) and Mary Stewart Countess Mar (age 27). He the son of George Keith 5th Earl Marischal (age 56) and Margaret Home Countess Marischal.

On 28 Dec 1614 [his son-in-law] John Leslie 6th Earl Rothes (age 14) and [his daughter] Anne Erskine Countess of Rothes (age 17) were married. She by marriage Countess Rothes. She the daughter of John Erskine 19th Earl Mar (age 52) and Mary Stewart Countess Mar (age 32).

On 18 Jun 1615 [his son] James Erskine Earl Buchan (age 21) and [his daughter-in-law] Mary Douglas 6th Countess Buchan (age 14) were married. He by marriage Earl Buchan. She the daughter of James Douglas 5th Earl Buchan. He the son of John Erskine 19th Earl Mar (age 53) and Mary Stewart Countess Mar (age 33). They were second cousin once removed.

On 09 Jun 1618 [his son-in-law] John Lyon 2nd Earl Kinghorne (age 22) and [his daughter] Margaret Erskine Countess Kinghorne (age 19) were married. She by marriage Countess Kinghorne. She the daughter of John Erskine 19th Earl Mar (age 56) and Mary Stewart Countess Mar (age 36). He the son of Patrick Lyon 1st Earl Kinghorne.

Before 1626 [his son-in-law] Thomas Hamilton 2nd Earl Haddington (age 25) and [his daughter] Catherine Erskine were married. She the daughter of John Erskine 19th Earl Mar (age 63) and Mary Stewart Countess Mar (age 43). He the son of Thomas Hamilton 1st Earl Haddington (age 62).

In or after 1628 [his son] James Erskine Earl Buchan (age 34) and [his daughter-in-law] Dorothy Knyvet were married. He the son of John Erskine 19th Earl Mar (age 66) and Mary Stewart Countess Mar (age 46).