Precessional Order?

HELP! I'm very confused about the order in which the precessional should go.....I know they vary, but what are you girls doing?

Here's what I have:
2 sets of grandparents for the bride (totaling 4)
MOB (my best friend will walk her to her seat)
FOG
4 GM
5 BM (including MOH)

So, which of the following is right (or most common):

Situation A:
- FH and GM walk up the side and stand at front
- grandparents sit down
-FOG sits down (MOG is deceased)
- MOB is seated
- BMs
- me and dad

Situation B:
- grandparents are seated
- FOG walks to his seat
- MOB is seated
-GM and FH walk down isle to the front
- BMS
- me and dad

Situation C:
- Grandparents and FOG are already seated on their own
- FH and GMs stand at the front
- MOB is seated
- BMs
- Moi and dad

Also - do you play music when the grandparents are seated?

I'm completely confused - FH says his dad shouldn't have to walk down the isle, he can already be sitting on his own, probaby the grandparents as well...... What are you doing?

This is what I'm doing:
Groom and Bestman
Grandparents
Brides parents
Grooms parents
BM and Groomsmen
MOH
Mini bride and Mini Groom
FG
Bride and Father

* The brides is the only one that's suppose to step on the flowers

HTH

We had grandparents walk down, but I think that's totally up to you if you want to do that or not.
DH walked down with his parents and seated them - maybe your FH could walk down with his father before taking his place up front?
If MOB is being seated, FOG has to be seated too - he's just as important.

here's what we did:

Grandparents walked down

DH was walked down the aisle by both of his parents and he seated them...

Best Man was already waiting at the altar

Groomsman walked Bridesmaids down the aisle

MOH walked by herself

then Flowergirl and Ring Bearer

then Bride and Mom and Dad- both my parents walked me down the aisle

music for everyone

from what ive seen in the past, it would always be:

Groom + best men + groomsmen
Grandparents of bride
Grandparents of groom
Mother of bride
Parents of groom
BMs
MOH
Ring boy
FG
Bride