Should a child call a stepparents mom/dad

So if the step parent is extremely involved in the child's life, sleep trained them, changed diapers, bathes, plays with child, reads to them, feeds them, clothes them ect and the bio parent came into the child's life after step parent and child lives with stepparents not bio parent and the child chose to call the step parent mommy/daddy and still calls the bio parent mommy/daddy as well, is that socially unacceptable?