Jemima was a daughter of Thomas Crew, 2nd Baron Crew, and his second wife, the former Anne Armine, herself the daughter of Sir William Armine, 2nd Baronet.

[1] A portrait of Jemima with her two sisters, Armine and Elizabeth, as children, was taken by Jemima to her new home at Wrest Park when she married; it was restored and returned to the house by English Heritage in 2017.

The gardens at Wrest Park, originally laid out by the duke, were later extended and remodelled by the couple's granddaughter, Jemima Yorke, 2nd Marchioness Grey.

[5] The duchess was buried in the Grey family mausoleum at St John the Baptist Church, Flitton.

[6] Following her death, the duke married Sophia Bentinck and had further children.