If your kids have season passes or a membership, they may have coupons that allow them to bring a guest in with discounts or free on certain days. Let them register their season passes on the Six Flags app. Once they register their season passes they will be able to check what kind of benefits they have.
Look at there coupon book for discpunts.
On drinks yes you can
Sometimes
No..only on days you can bring a guest.
Thanks! Your answer is awaiting moderation.