This situation might be described as "maternal hatred." It can stem from various psychological, emotional, or environmental factors, including unresolved childhood issues, emotional abuse, or strained relationships between the mother and son. Professional therapy and support may be helpful in understanding and addressing these feelings.
In "A Child Called It," the father did not intervene to protect his son due to his own issues, such as alcoholism and his own abusive tendencies. He was not emotionally or mentally equipped to stand up to the mother and protect the child. Additionally, he may have been influenced by fear of the mother's wrath or manipulation.
Your mother's brother is your uncle. Your uncle is your son's great uncle. You are the nephew of your mother's brother. Your son is his great nephew.
Your wife's mother's brother' son is your wife's first cousin, but is not rtealted to you.
Your mother's brother's son would be her nephew and your cousin.
Your mother's elder sister's son is called your cousin.
cousin
The most traditional method by which a father legitimizes his son is to marry the son's mother. It is also possible to formally recognize the son as his own, even without marrying the son's mother.
Your wife's mother's brother' son is your wife's first cousin, but is not rtealted to you.
I personally don't think Rainflower hates Crookedstar because they are mother-son. But it's probably just a rumor.
If mother and son own real property as joint tenants with the right of survivorship when mother dies the son will become the sole owner and the property will not become a part of the mother's estate.
It is called, in psychology, the "Oedipus Complex".
Cousin