The Bible forbids intimate relationships between relatives in Leviticus 18:6–18, 20:11–21, and Deuteronomy as well as other places to prevent people from getting involved. . None of you shall approach anyone who is close in relation to him in order to expose their nakedness: I am the LORD, according to Leviticus 18:6–14 (KJV).
You must not reveal your sister's nakedness or the nakedness of your mother's or father's daughters, whether they were born at home or abroad.
The nakedness of thy son's daughter or thy daughter's daughter is not something you should expose because it is also thy own nakedness.
Leviticus 20:14
"If a man marries a woman and her mother, all three shall be burnt to death because of the disgraceful thing they have done; such a thing must not be permitted among you."
Regarding A Malawian Newspaper Article A woman by the name of Njemani wed her son because she educated him and spent a lot of money on him; as a result, she didn't want any other woman to wed him in place of her.
" I invested a lot of money in the education of my son. Why should another woman be married to him and enjoy the hard work I invested in him. That will not happen. I'm marrying my child so that we don't empower other ladies who have been aborting."