The SSPX website informs us that the last living sister of Archbishop Lefebvre passed away on October 17th 2017. She was also the Archbishop's god-daughter. Born Marie-Therese Lefebvre, she had married Mr Guy Toulemonde.
In the film "Archbishop Lefebvre - A documentary", she had given the testimony that Archbishop Lefebvre had considered the possibility that the Society could disappear or fall. Here is what she said: "I remember having asked him one day: "After you die, what will happen to the Society? And he answered: "If the Society is from God, it will go on, if it isn't from God, it will die". I am sure that it is what he wanted: that the Society do the will of God".