Can some one name a flashback Charlie had about family in the book flowers for algernon

Charlie is overcome by a sequence of flashbacks to occurences from his youth. These flashbacks are stimulated by experiences in the present: when Charlie is propositioned by the pregnant woman in Central Park, for example, he recalls his mother’s pregnancy with his sister. All of Charlie’s memories come in the form of such revelations and recall events of which he was not previously aware. These new memories hold new lessons for Charlie about his past and shed new light on his present neuroses.