Added:
just read your SWH. Ok - I had forgotten your kids were older. Oh ya ... I would not be taking this on. Love chacha's answer (made me chuckle) - Mamazita, you hit the nail on the head.
Just a thought ... there's people pleasing and then there's children being a tad disrespectful. Your grown kids should know how much you've got going on (with your special needs children, your parents, etc.). They seem a little ... I don't mean to be offensive, but my husband would tell my kids to stuff it if they suggested this to me and I was in your shoes. I'm glad you're saying no :)
I know you didn't ask about that - but you'll have your hands full as it is. Enjoy the white russians while preparing the feast :)
****************************************
I am thinking beet soup (borsch?) maybe that's Christmas Eve
I love pirogies as well like B says. Those are very fun (somewhat messy) to make but even I can make those and have.
Not sure they are Russian .. Ukrainian? Sorry - I should know this ...
Are you getting assigned this task? If it's your kids' idea, maybe they could take on the culture part (google) and just add even something simple like appetizers, breads, cheeses, cookies .... easy to look up :)