The short answer whoever YOU want.
Don't be afraid to hurt feelings by protecting your birthing space. Birth isn't for other's entertainment, it's not a spectators sport. It's a sacred & private time. You are going to be in your most vulnerable state.
So instead of telling you who SHOULD attend your Birth let me humbly tell you who should NOT.
Anyone who isn't fully supportive of your birthing choices.
This includes your provider.
Anyone who isn't capable of providing a calm environment.
Anyone you won't want to be naked. Butt Naked. Fully exposed around.
So what did or does your birth team look like? Did you / do you feel fully supported by the team you've chosen?