First off, congratulations on getting your passport request!
Now, for yourself, definitely you have to get it done, i.e., get your passport stamped. As @ fkl pointed out yesterday, you have to get your passport stamped for work permit or open work permit. But what's a little confusing is that with your open work permit, i assume you don't necessarily have a job offer yet? If you have a job offer, then its all fine, but if you don't, then I'm not sure what you'll enter in the Employer section of the form that Protectorate office provides you.. The form can be found here http://www.beoe.gov.pk/Forms.asp ....... I think we'll have to choose the Direct Registration Form
For your spouse, if its open work permit, then again, you'll have to get it stamped.
For kids, no need as it is applicable only to work permit visas.
That's all I can say to the best of my knowledge