Katherine de Vere is your 29th great grandmother
@Katherine of Flanders is my 29th great grandmother Judy Rice
Katherine de Vere (de Flanders) Countess of Ghesnes is my 1st cousin 27 times removed.
@ Katherine de Vere (de Flandres), Countess of Ghesnes is my 27th great grandmother
Katherine of Flanders is my 26th great grandmother.