So is Joanna's 1st marriage was to Robert Bond de Lutton around 1440 & had 2 sons (William born 1455 & John born 1444).
Her 2nd marriage is to Nicholas Latimer (born 1427), on 17 December 1450 and they had 2 daughters Margery (Born 1453) & Edith Latimer (Born 1450). The dates of marriage and the birth of the children are not adding up.