There is a thing called the Christmas Train in OK that is a big event that sells out rather quickly. Last year my sister and I had bought tickets but didn't go due to the freezing temps and snow that showed up. We talked about going a few weeks ago since we didn't get to last year. I asked my sister first thing this morning if she was going to get tickets and she said that she already did (they went on sale today). I asked her if she got me one (DD and DS will be free) and she said "No, I didn't know that you want to go." WTF?? So now, do I get myself one ticket on a day that isn't already sold out and just take 2 year old DS and 4 month old DD, alone, or let DS go with sister and her family while I sit at home with DD? Do I want to wrangle the both of them, alone, in the cold? WWYD?
Re: WWYD?
I think your sister should get some coal in her stocking this year.
Since it seems too late to go this year now, I would just plan on getting tickets next year no matter what your sister chooses to do. DD will probably enjoy it more at 17 months old and you might enjoy it a little more too seeing excitement on both of their faces.