My nephew has been mistreated by his mother since he was a baby, and it continues even now, at the age of 28. My unmarried sister, who lives in a world of negativity, aids his mother in this cruelty.

Based on Indian law, your nephew may be able to seek legal protection against his mother’s mistreatment. He can approach the court with evidence of the abuse, and a court order may be issued to restrain his mother from further harm. Furthermore, your sister’s involvement could be considered as abetting the abuse, which is also punishable by law.