Tankerville's other interests included maps and shells. At the end of his life his collection was sold for an undisclosed sum, but thought to be between three and four thousand pounds. Tankerville married Emma Colebrooke on 7 October 1771 in
Gatton, Surrey. It was the first tropical orchid to flower in England. Their daughter Lady Mary Elizabeth Bennet (21 May 1785 – 27 February 1861) worked with their gardener (William Richardson) to cultivate new strains of tri-colored viola
pansy flowers that were presented to the botanical society and horticulture groups in 1812. Lady Mary Elizabeth Bennet was a watercolour artist included in many exhibitions. She was trained by London artist
John Varley. Her works are on exhibit and in private collections including a composition of her home at Belsay Castle rendered in 1834 after her marriage on 26 July 1831 to Sir Charles Miles Lambert Monck, Bt. The painting of her home at Belsay Castle in
Northumberland by Lady Mary Elizabeth Monck was found to be included as part of the Monck estate in 1912 and now resides in a private collection in the United States. Another of her works is the "Burial Place of the Breadalbanes from the Churchyard at Killin" done in 1826–1827 on a trip to the Scottish highlands with her brother. This haunting graveyard work may have been inspired by the seat of her father's estate as the Earl of Tankerville being at
Chillingham Castle which was said to be haunted. From 1815 to 1823 (before her marriage) artist Lady Mary Elizabeth Bennet also trained and worked with the genius London artist John Linnell in engraving as well as miniature painting on ivory. They together produced a set of (12) engravings about Chillingham Castle that were started in 1815 and not finished and published until 1818. The Hon
Henry Grey Bennet, their second son, became the member of parliament for
Shrewsbury in 1806 whilst their third son, The Hon John Astley Bennet, became a captain in the
Navy but died in September 1812. The 5th Earl,
Charles Augustus, who was born on 28 April 1776 was
treasurer of the household during the short administration of
Mr Fox in 1806. Their daughter, Corisande Emma Bennett, married
James Harris, 3rd Earl of Malmesbury on 13 April 1830. ==References==