Why is Einstein so smart, his two children are crazy?

Einstein is a great scientist and a Nobel physics creator. His achievements and contributions to humanity are remarkable.
Einstein had two marriages in his life, three children, two of whom were mentally ill. His three children were born with the first wife, Mileva Marik.
The eldest daughter, Lisell, was born in February 1902. She is an illegitimate child, the first child of Einstein who was pregnant with Mileva before graduation.
It is said that this child is mentally ill, and it is puzzling that Einstein has never seen this daughter. Later, I didn't know where the child went. The couple did not mention the child again. The daughter's whereabouts became a permanent mystery.
The eldest son, Hans Einstein (May 14, 1904 - July 26, 1973), healthy person. He is a professor of water engineering at the University of California, Berkeley, a prestigious institution of higher learning in the United States.
The younger son, Edward Einstein (July 28, 1910 - October 25, 1965) was a pianist and studied medical and psychiatry hard. He developed schizophrenia at the age of 19.
First, genetic causes
Mileva’s mother had a mental problem, and Mileva’s personality was gloomy and depressed, and her sister’s spirit was also problematic. Schizophrenia carries genetic genes, and unfortunately Edward has inherited the bad genes in the mother's family.
Second, the growth environment caused
When Edward was 4 years old, his parents separated. When he was 9 years old, his parents divorced and grew up in Zurich, Switzerland, so he rarely met his father who lived in Berlin. When Edward was in his 10s, he was full of admiration and admiration for his father, and he wrote a letter to his father with great interest. However, due to the neglect of Einstein, he forgot to reply and caused his long-term resentment and pain.
The misfortune of the family and the lack of fatherly love are also one of the causes of illness. In spite of the opposition of the parents of both parties, Mileva resolutely married Einstein and gave up her career pursuit after marriage. She became a housewife and took care of two children alone. During the period of hardship and hardship, she was sad and wrong. And know.
And Einstein was at the heart of his work, and he was looking for a lover outside. This is something that no woman can bear, and her own personality is also gloomy and introverted. In this case, Mileva’s mental state is very bad, and More and more depressed, and bad emotions are contagious. Young Edwards grow up in this environment and have a certain stimulation of his mental state and mental health.