Our friends live in the suburbs of Chicago. In their community, i.e. in the village of
There are 50-100 private homes, no more Russian families, only white Americans.
Well, a couple of Chinese for diversity. The housewife, say Lucia, recently brought her father to visit. After a while, he sees his dad standing on the border of the neighborhood and talking lively with an elderly lady. It must be, Lucia thinks, I never imagined that Daddy spoke so much English. Finally, the father returns and with satisfaction reports that he has not spoken Russian with such pleasure for a long time.

Lucy goes to her neighbor Karen to ask her mother where she knows Russian.
A-a-a, Karen cries, so it turns out to be Russian! And we guessed.

What was discovered. Karen’s mother has long been dead, and the elderly lady is her grandmother. Grandma at lunch 100 years old, she has Alzheimer's disease, she lives, as usual in the Americans, in a dear nursing house, but grandchildren periodically take her to host. Several years ago, under the influence of Alzheimer's, my grandmother stopped speaking and understanding English, and began to carry some sort of abracadabra. Now with help.
Lucy's dad discovered that it was not an abracadabra, but a very meaningful Russian speech, and the grandmother remembers the events of her childhood perfectly - but later events no longer remember. Her mother, it turns out, was a Russian nobility and fled Russia, apparently during the revolution, when her daughter was three to four years old. Here she soon married an American, died a few years later, and her daughter grew up to be a perfect American and had no idea of her Russian origin until she was born.
90 years old Alzheimer did not erase the upper nanoscale layers of memory.