If a woman who has custody of a child marries the child’s paternal uncle, is her custody terminated?

Question:
He says: Honorable Shaykh, may Allah grant you success, if a woman who has custody of a child marries the child’s paternal uncle, is her custody terminated?

Answer:
He says: If she marries a stranger who is not a mahram, her custody is terminated. But her brother’s father is not a stranger; he is also a mahram to his sister’s daughter. Yes.