Tashek

Tashek was the older sister of Colonel Nasgard and the aunt of Yarvell and Davros. She helped Lady Calcula raise her children while she was away from home on business. A former nurse, Tashek knew from her brother's medical records that he was sterile and therefore not Davros's biological father. Calcula hated Tashek for knowing the truth, and Tashek hated Calcula for not telling Nasgard the truth and for favoring Davros over Yarvell. Shortly after Nasgard returned home due to his deteriorating health, Tashek told him he was not Davros's father. Minutes later, they were both killed by a bomb planted by Calcula. (BFD: Innocence)