Your husband would have to retain an attorney to start a custody action an establish his rights. Then, assuming that the attorney was able to convince the court that both you and your husband have a substantial parent-child relationship with your stepdaughter, the court might refuse to permit the move.
It really comes down to the consistency of the existing relationship. Moreover, we're talking about HAWAII here. If this girl is older than 11, you probably won't be able to stop her from leaving unless the judge orders a ball and chain.
Seriously, though, without your husband maintaining a continuous relationship with the child, it may be very difficult to stop the move.
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