Baby shower etiquette questions

Esther
I am not sure what to do about my baby shower. This is my 2nd baby but they are 6 years apart. I didn't have a shower for my first (just a few presents) and we don't have a lot of stuff leftover from my first for this baby.
My sister in law is wants to throw me a shower and I've put together a list of invites...is 28 guests too many and tacky? Should I still invite my family (9 of the guests) who most likely won't come due to 6 hours of distance? They will not be throwing me a shower back home as I will not be traveling home between now and the birth. 
Would love your thoughts!