Baron Willem Karel Mackay

3. William Karl, m. Nicoline Engelvaart, issue two.

pg. 342

 THE BOOK OF MACKAY BY ANGUS MACKAY, M.A. (St. Andrews  University) Minister at Westerdale, Caithness EDINBURGH :  NORMAN MACLEOD, -25 GEORGE IV. BRIDGE CANADA : EDWARD MACKAY,  ST. PETER'S MANSE, MADOC, ONT. M DCCCC VI

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(a) Baron Willem Karel, born 17 August 1843; married, 13 September 1869, Nicoline Engelvaart. She died 2 February 1905, had issue :

• a. Barthold, born 14 May 1871; married, 17 February 1898, Alpheda Louise van der Wyck, with issue.
• b. Catharina Wilhelmina, born 21 August 1873 ; died 1 May 1903.
• c Margaretha Johanna, born 30 May 1876 ; died

Scottish Peerage pg. 173