Here is the info on season passes:
http://www.bransonsilverdollarcity.com/tickets/seasonpasses.aspx
SDC is a tough discount to get. But you can save a bunch of money if you order season passes in the next two days (by the end of the year). You do get a Bring a Friend certificte that would be good for the dates you will be there. Pricing depends on your age. For example, if you and your wife are "seniors" over 62, your passes would be $53.24 each. Child pass 11 yrs or younger is $48.98. Adult pass would be somewhere in between that. You'd have to figure out what is best way for you to go, I don't know that a "child" could bring in an adult on a BAF cert. Also, anyone you buy a pass for, you should keep in mind that person is the only one who can use the pass, they are very sticky about showing ID when you enter the park (At least for adults, don't have any experience with kids). Keep in mind those persons you buy passes for could visit at any time thruout the season. There are also BAF certs for use later in the year. Also, if you plan to buy food in the park, the pass saves you some money.
So, as an example, you buy 2 senior passes and 3 "adult" passes, would cost you approx $260, whereas 2 senior, 3 adult, and 5 child one day tickets would be about $327.50 or more as I don't know what one day admissions will be for 2006. This is if I have figured things generally correct subject to ages of you and your grandchildren.