I would think that having people over to share an American holiday, that American Rules were in order. Besides, I think in this case, the items were brought as
gifts and it's up to the
hostess when and if they should be opened/shared. To point out what your SIL thought was a faux pas on your part was doubly wrong.
The Brits have Mrs Beeton!
From
http://lifewise.canoe.ca/LifewiseWorkEtiquette/eti_work13.html"If you are attending a meal-oriented function, it's best to call ahead and see if there is something specific the hostess would like you to bring that will compliment the meal. Otherwise, do not be offended if the hostess opts not to serve or pour your gift. Remember - it's a "hostess" gift which he/she may use at their discretion."
From:
http://www.party411.com/queen02b.html"When a host receives a bottle of wine as a gift, should the bottle be opened and enjoyed at the event. Is it rude for the host to set the wine gift aside and make another selection from his own collection?
The Etiquette Queen says:
No it is not rude. Usually the host has planned the wine ahead to go with whatever he or she is serving. The gift should be savored later."
From:
http://www.post-gazette.com/food/20010222entertain4.asp"My goal as hostess is to make my guests feel comfortable and to ensure that they enjoy themselves. Opening gifts at a small party or dinner can make other guests who might not have brought a gift feel uncomfortable"
and
"The general guideline, however, is that food or wine, when brought as a gift, should not be consumed immediately, but put aside, to be opened at a later time"
From:
http://forums.chef2chef.net"You should always presume that your wine will NOT be opened if it is a dinner party. If it is a casual get together wherre the host has suggested you bring whatever you want to drink, that's another story altogether."
From:
http://www.pagewise.com/wine-bottle-buying.htm"Remember, traditionally, a bottle of wine presented to a host or hostess by a guest is a gift. Although he or she may choose to do so, the host or hostess is not obligated or even expected to serve the wine with that evening’s meal."
...I can go on, actually. I found 12,000 hits when I searched. So far no disagreeing with the consensus. Uhhh...safe to assume that while your SIL might be the sweetest person in the world, she is also WRONG.