Inexpensive Christmas.com

We’ve been together for nearly a year. I go to my bf’s house usually once a week, but we usually just leave to go somewhere so I don’t talk to them much.
But I wanted to get them all something inexpensive for Christmas, just to be thoughtful.
He has a 19 year old sister, and I thought this was cute for her:
http://shop.nordstrom.com/S/2993898/0~2376780~6009391~6012441~6012444~6012813?P=1

I don’t know what to get his little brother who is 11.
But I thought maybe some nice candles or something for his mom.
And no idea for his dad.
Does anyone have any ideas?
And is this appropriate to do?
I don’t expect something from them or anything, I just wanted to be nice.