Don't be misguided by any wrong opinion or suggestions.
There is no law to provide child custody to the grandparents especially when the biological mother is hale and healthy to take care of the child which is less than 5 years old.
The grandparents can claim child custody only if the biological parents are not capable of taking care of the child which may adversely affect the interest and welfare of the child which is paramount.
In fact they do not have any legal stand even for visitation rights as a right as per provision of law.
Your sentimental issues do not have answers in law.
Hence you may better look for a diferent type of solution in this connection by arranging a meeting with the elders from both the sides to reconcile the differences and get the desired taks achieved.