Hello and welcome to the Moms Panel!
It melts my heart when I read about guests trying to do something special for other guests. Personally, I think this is what Disney Magic is all about. They are lucky to have you in their lives.
Some Disney restaurants do offer alcoholic beverages for their guests. I am not sure if your cousin has already set any dining reservations, but you will need to find out if they are dining at any of the restaurants that do offer such beverages. Also, I was not sure if you would be attending any of these dining experiences with them since your question was cut-off. If you are, it would be very easy to secretly let your Cast Member know about wanting to surprise them when you arrive. Many of our
Fine/Signature Dining Restaurants do offer champagne, but you will need to know if your family is dining at any of these establishments. Securing their reservation number secretly may prove difficult. However, should you be able to grab their number, you can call
(407)939-7675 and asking a Dining Cast Member if you can add a "surprise" to their reservation. Again, if you are attending any of these dining experiences with them, simply let your Cast Member know and they may be able to put something together. There are also other great surprises you can do such as having a cake delivered to them while they are dining. Simply call
(407)827-2253.
~Have a
MAGICAL day and
"SEE YOU REAL SOON"!~