Family - Erskine of Mar and Erskine of Dun Connections - Mary Erskine
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Mary Erskine (b 1597), married at the age of 12, eldest daughter of
Sir John Douglas Erskine, 19th Earl of Mar, 2nd new Earl of Mar,
12th Lord Garioch, 7th Lord Erskine
(1556 – 14 Dec 1634)
by George Jameson

Her father-in-law, husband and two eldest sons were all Earls Marshal. Of the 10 Earls Marshall, there were 7 Williams, and 3 Georges. There were also two numbering systems – note that www.thepeerage.com uses the other system. So no possibility of confusion.
Her father-in-law

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George Keith, 5th Earl Marischal
(~1553 – 1623)
Her husband

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William Keith, 6th Earl Marischal
(~1585 – 1635)
by George Jameson
Her eldest son

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William Keith, 7th Earl Marischal
(1610 or 1614 – Mar 1670 or 1671)

His younger brother George Keith (d 1694) then became 8th Earl Marischal.