[6] Sir Richard and Joan had one son: By the year 1499, she served as the Lady Governess to Princesses Margaret and Mary.
Erasmus referred to Joan in 1519 in a letter to her son, Henry, as "the noble lady your mother", wishing her happiness and prosperity.
[9] Shortly before the Infanta's marriage to Prince Arthur, according to The Recyt of the Ladie Kateryne, on 6 November Joan was at Dogmersfield Park and partnered Prince Arthur in a Spanish dance accompanied by Catherine's musicians,[10] "Lady Guildford danced right pleasant and honourably".
That same year, she inherited a life interest in a house in Southwark, along with lands in Norfolk and Suffolk from Sir Thomas Brandon.
She was compelled to pay Brandon's nephew, Sir William Sidney, the sum of 20 marks a year in rent.
(See main article: Henry VIII of England) As a former lady in the household of Elizabeth of York, Joan was summoned to give a deposition as to whether Prince Arthur and Catherine of Aragon had consummated their marriage.
It is recorded that she received several New Year's gifts from Henry VIII, including a garter with a gold buckle and pendant in 1532.
In her last will, which was dated 30 August 1538, she left bequests to her cousin, Sir William Penyston, a niece, Bridget Walsh, her nephew, Lord Vaux, and Maud, her lady fool.