Annemarie's parents find it very painful to speak about her older sister Lise. What is the reason they do not like mentioning her? *

Because she died in a car accident, two weeks before home, her death was very painful for Annemarie's parents and they believe it may have been linked to the resistance to the German invasion.

Explanation:

Anniemarie's older sister Lise was 18 when she died and was entering a new phase in her life, as she was to be married in two weeks. He was excited, full of plans and happy. Her death was a very unfortunate moment for the family who loved her very much and talking about it causes more pain and remorse. They also have doubts as to whether her death was really an accident, or whether it had any connection with the resistance to the German invasion.

you need to make an explanation. so, since you did not include one, so no one, and i mean no one can unfortunately you,

the correct answer is aesthetics.