Visitation/custody rights for grandparents

Hi, [Situation]: My real brother was deceased about 2 months ago in a car accident. He along with his wife and 7 year old kid lived with my parents. Relation between the daughter in law and both my parents have been always bad and has not improved. My dad owns a business and is the sole owner of the business. My mom is a house wife. My sister in law was a house wife for last 8 years, but recently (~2 weeks) ago started a teaching job. We live in a tier 2 city with good schools where my niece is currently studying along with her social up bringing (dance class, drawing class, sports etc). With my brother gone, my parents are almost every day in tension due to bad behavior of my sister in law. [Ask] My parents don't want to live together with my sister in law any more, but are worried for 2 reasons, in case we ask my sister in law to leave our house and go back to live with her parents. 1. We don't want to hurt the education & social up bringing of the kid. My sister in law is from a tier 3 city with no good schools. Being a village, this will also impact the social up bringing of the kid. We are in for paying for the education the kid. Ideally, we would want to put the kid in a good school hostel of a tier 1 city. 2. They want to ensure the grand kid can visit them 2-4 times a year and they have visitation rights. Arrangements for bringing the kid can be made by parents. P.S: I have a masters degree in computer engineering. My dad's extended family is also well educated which is not true with my sister in laws family. I wanted to check about the law related to this, more so to understand if my sister in law can take away the visitation rights and screw up the child's upbringing.