Adult Bengali adopted daughter

What is the name of your state? - Texas

My wife and I (both 59 years old) have 5 living adult children from our marriage. These children range in age from 38 to 23 years. We have also "adopted" another adult woman & her daughter as our daughter and grandaughter.

Salma is 37, one year younger than our oldest natural child. Her biological parents are alive and reside in Bangladesh. She has no other family members in the United States.

We are friendly with, and in communication with her birth parents, brothers & sisters in Bangladesh, and with her married sister in London, England. Although we have tried to treat she and her daughter the same as our other children & grandchildren, her daughter regularly asks if we have ever "legally" adopted her mother.

If this is possible, my wife & I would like to do so. Salma is also desirous of this. Can this be done without terminating her legal relationship with her birth parents?

She does not want to hurt or alienate her Bangladeshi family. She (and we) wish to make our loving family relationship legal and permanent.

Advice appreciated.

[JETX]

It can be done.... but not without a LOT of ordeal (due to her biological parents, being a legal adult and her immigration status).
I suggest you seriously consider the repercussions from your doing a 'legal' adoption. This is a fairly common ploy by TCN (Third Country Nationals) as it gives them legal standing as to your property. Simply, the adopted 'child' will have a full share to any inheritance or estate that might arise. Depending on your financial status, the natural children will be affected by her being added to the 'distribution'.

A couple of items I left out in my initial message. Salma is a citizen of the United States. She went through naturalization proceedings several years ago. Her daughter (my grandaughter) was born in this country and is a native citizen.

Our other children are aware of, accept, and support our decision. The distribution, as such, will probably be drawing lots to see who covers the final expenses and pays off the bills. They don't mind having someone else to help carry the load.

Salma owns her own business & her own home. She is not dependent on us financially. We have already adopted these two into our lives. They are already our daughter & grandaughter. This was a lifetime committment, made after consideration, prayer & discussion.

My only purpose in pursuing adoption is to bring their legal standing into accordance with their position in the hearts and lives of my wife and me.