Character sketch of edith frank .
What role did otto frank play in anne`slife

Anne accuses her mother, Edith Frank, of being cold and tactless. Although it’s clear to the reader that Anne’s mother is hurt by her daughter’s rebuffs, Anne accuses her mother of instigating that dynamic in their relationship. Mrs. Frank does appear to be similar to Anne – outspoken and frank (guess the last name fits!). She often responds to Mrs. van Daan’s provocative comments, and the two women frequently end up fighting. Sometimes, it appears that Mrs. Frank initiates the fights. Anne thinks there is nothing about her mother that is actually motherly, but often wishes she could have a caring, warm mother to turn to. Anne and her mother never develop the kind of close relationship that exists between many mothers and daughters.

ROLE OF OTTO FRANK
  Anne sees her father, Otto Frank, as a kindred spirit. Like Anne, Otto is a perpetual student, inhaling books, history, and news, and he encourages these interests in Anne. Also like Anne, he is a clown, frequently trying to amuse those around him and lighten up the mood of the Annex. Unlike young Anne, Otto seems to be basically even-tempered and eager for peace in every situation. In the claustrophobic and tense living situation, Otto often served as the peacekeeper between the Franks, van Daans, and Dussel.

As much as Anne adores her father, she occasionally voices her concern that her father doesn't recognize her for the mature young woman she feels herself to be.

I model myself after Father, and there's no one in the world I love more. He doesn't realize that he treats Margot differently than he does me: Margot just happens to be the smartest, the kindest, the prettiest and the best. But I have a right to be taken seriously too. […] I'm no longer satisfied with the meaningless affection or the supposedly serious talks. I long for something from Father that he's incapable of giving. […] It's just that I'd like to feel that Father really loves me, not because I'm his child, but because I’m me, Anne. (10/30/1943.5)

Anne turned out to be right to some extent: her father didn't realize the depth of her emotion or maturity. As he said after the war: 

It took me a very long time before I could read it [Anne's diary]. And I must say, I was very much surprised about the deep thoughts that Anne had, her seriousness, especially her self-criticism. It was quite a different Anne than I had known as my daughter. She never really showed this kind of inner feeling. She talked about many things, criticized many things, but what her real feelings were, that I could only see from the diary. (Source)

Their fiercest rift, which actually leads to much growth in Anne, is over Peter van Daan. When Anne asks her father if he approves of her relationship with Peter, he initially gives a somewhat grudging yes. You can almost hear him thinking that her romance with Peter might just be the only one she ever has.

But then he changes his mind. Why? If Otto "settles" for Peter as Anne's "final boyfriend," then he would be admitting that Anne is going to die – an unbearable thought. It is also giving in to the idea that the Nazis ultimately would win their war against the Jews – another horrific thought. Refusing to support Anne's relationship with Peter, then, would mean Otto is refusing to accept either of those dreadful outcomes. We will never know exactly why Otto changed his mind, but we think these are plausible explanations. What do you think?

As the only member of the Annex that survived the Holocaust, Otto Frank bore the burden of history. After Anne's death, he fulfilled his daughter’s wish to have her words published.