<human>: I'm just wondering if there's anything that might be a nice thing to do for him tonight. He just mentioned it to me this morning before we left for work, I had no idea when her birthday was. A somewhat weird coincidence is that the sister's birthday is today, my birthday is tomorrow, and also, his mom's birthday is tomorrow. He was close with his sister when he was a little kid, but she put his family through a lot of torment in the final years of her life.

I was thinking of picking up a few cupcakes with candles tonight to commemorate her. I'd like to hear from reddit as to if you think this is appropriate, or if something else might be better suited.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Wondering if there's anything I can do for my boyfriend tonight, who casually mentioned that today is his dead sister's birthday.