Take it from me, you'll LOVE this vacation!!!! I do recommend you simply call her and tell her that you found out that they had switched to the Poly...TAKE ALL THAT SENSITIVITY and spit it out before you call or you really will have a bad trip. I have a sister and I know how this one incident is really not about this one incident...it's a piece of hay on a haystack 10 feet tall and it's throwing you over the edge. I can show you how the conversation canl go....
Sis..."Hello."
You..."Hey, I was just calling to get all of our reservations confirmed since we put them on your card and they told me y'all were at the Poly. Hey, you're going to stay at the Poly??? You lucky duck!!! Maybe we can plan to meet at 'Ohana's with the girls one night, I hear it's a great resort! But they're not showing park hoppers for our family...is there anything we need to do to make sure we have them before we arrive?"
Now, make sure you don't have any snideness or cattiness in your voice..sisters pick up on that even when it's not there. Before you call maybe sit with your precious daughters and color with them and envision all the great pictures and memories you'll have from taking them to a family trip. Your sister was wrong not to tell you, but she also didn't want to create strife...I can see it happening this way in my family...my husband would in no way want to spend his vacation time with an extra set of youngsters under 3....it's really not peaceful and the women end up spending all the time together and it's hard to have family time. We did that one year and actually stayed with my sister in a 2BR OKW room...it was just much more work than staying in our own room and being able to manage nap times easily and have fun family time.
Don't look at this as she's got more and we don't or she's being dishonest..you're taking a GREAT vacation with YOUR family...it's a treat that you get to mingle while there but the only people who will remember having their "cousins" right next door would be you and your husband...your children are too young to remember...but they will "remember" through all the great pictures/scrapbooks/albums you create from having great trips and those smiles when the 8 of you do get together for dining and such. This is a vacation...not a power struggle...let it go and enjoy yourself.
Tara