fuzzytrees answered your question: For Christmas my grandparents gave me some babies…Looks like some sort of kalanchoe to me. Strong resemblance to K. pumila, but it’s too dark for that.
I was looking through kalanchoes earlier and thought it looked a little bit like the K. longiflora. The leaves on mine aren’t as shiny though. It could be some sort of hybrid, of course.
Ah, that one isn’t in my book! Some of the images of K. longiflora that google pulled up look like your mystery and some don’t… hmm… And a hybrid/cultivar/natural variation is always a possibility.