Marriage A Widow Lady and Adopt her 5 years only Girl Child.

Sir, Most humbly submit that I want to ask something about a widow lady. Her husband died in an accident. At that time her husband's family tried to claim some accidental insurance against the vehicle's company or owner. Finally, After morethan 2 years they won and got the claimed amount from vehicle's company. Accordingly, that amount issued to their family and to her. One part of that amount also fixed in favour of her child which she claimed after 18 years of her child's age. I have doubt for few questions. Her baby have an aadhar card where her father's name mentioned. Now, I am going to do marriage with her and also adopt her baby. But in my mind few questions arise please resolve : 1. My wish that her baby will never know about her real father. Can I add my name instead of her father's name by updating her aadhar card. 2. If I change her name Identity. Will that lady lost the money which is fixed in favour of her baby. 3. How can I manage both of above points. 4. Any extra suggestion which help me.