I have not done an adoption where the parent is deceased. I imagine it is the same two step of a termination of the biological parent's rights and the step parent adoption. I would wonder about the affect on her biological father's family and her relationship with them. Another much less expensive option is to change her name. Either way, hire a Family Law Attorney.
This does not establish an attorney/client relationship. Dallas, Denton, Collin and Tarrant County, Texas practice area. Principal office located in Lake Dallas, Texas.
My suggestion is to hire a family law attorney in your area who has experience in the field of adoption who can assist you with the proper steps. n
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The options are a legal name change or a step parent adoption. Consult an attorney to determine which is right for you. The name change us less expensive but it may not accomplish all your goals such as creating intestate inheritance rights.
This answer DOES NOT establish an attorney-client relationship. This answer is based on the limited information provided and is not intended to be conclusive advice. There are likely other factors that might influence or change the advice after a more lengthy consultation.