Will Dispute

Hello sir/ Madam My name is Karan and currently, I am living in Delhi. So coming to the point 17 years ago my parents were serving domestic help to 2 senior citizens from last 10 years. Both senior citizens do not have any children's of their own. So they adopted my mother as their daughter by getting impressed by her domestic help and serving. The senior citizens do not have any immovable assets they only have their two-term deposit accounts and one personal saving account in the bank. so they made their WILL that after their demise my mom can operate or accounts should be transferred to my mother's name. Right now we had an original will with us but we do not know how to proceed with that will in a proper manner or how to get it transferred on my mother's name according to the will. The problem is the bank's accounts which are mentioned in the will are situated in the USA. I do not know how to proceed with the will legally. Can anyone help me or any good lawyer from Delhi who would like to handle my case please leave the comment below..