If you are sponsoring your husband and kids, Then He will have to get a workpermit for if he is going to work. Or he will have to cancel his present visa ( Which is sposored by you) and transfer in to the new employer's visa which can be done without exiting the country by paying additional fee of 500 dirhams . He can come on a visiitors visa with you and after accepting a job offer can switch to employment visa but this need exiting the country.