Spa balcony mini suite for four guests

If we book a spa balcony mini suite does it mean that all of the guests in the cabin will have access to the spa? I'm booking for my inlaws and our aunt and uncle are staying with them in the same cabin (b6 large balcony). The prices dropped on our 14 day cruise and we can upgrade to a mini spa balcony for 200$. Just wondering if it might be worth it. We have a large balcony and they don't mind either way. Last time we went on a cruise together they had an inside cabin so they don't really care for a balcony. However I thought it might be a treat if they could be surprised with spa access.

I believe just for 2 of them. You can always purchase the spa package.

Thanks for your response! If there are only two spa passes for the spa cabin, could they be used interchangeably? Like if both gals wanted to go or both guys.

No, they are tied to the guests and they will be swiped in.

All 4 guests in the cabin will have spa access. Not just the first 2.

Actually my travel agent just called and said everyone in the cabin has access to the spa. Woohoo! :)