One person of this surname analyzed forgetfulness 
One person of this surname analyzed forgetfulness and loyalty to the dead in the work "About Losing and Being Lost." That thinker contributed to a field mainly concerned with "defense analysis," which that person claimed can be studied through the manifestation of a person's associations. Another person of this surname discovered a phenomenon in which people shift feelings about one person to another, called transference. That thinker also discussed "thanatos," or the death drive, in his work Beyond the Pleasure Principle. For 10 points, give this last name shared by a father-daughter duo known for their work in psychoanalysis, Anna and Sigmund.
One person of this surname analyzed forgetfulness and loyalty to the dead in the work "
Freud [Accept Anna Freud and Sigmund Freud, or Sigismund Schlomo Freud.]