Bio parent dies leaving 2 kids?

The couple were married when the two kids were ages 14 and 12. The bio parent passed away and the step parent took care of the kids. Now with one child age 18, what are all the obligations does the step parent have for an adult step child? Since the 18 year old wants to remain in their native country and not come... show more The couple were married when the two kids were ages 14 and 12. The bio parent passed away and the step parent took care of the kids. Now with one child age 18, what are all the obligations does the step parent have for an adult step child?
Since the 18 year old wants to remain in their native country and not come to the USA with the bio parent and younger child. Thanks.
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