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I'd say that the spell would fail if you try to cast it while grappled, and my reasoning is as follows.
- Emergency Force Sphere says it functions 'As Wall of Force, except..'
- One of the caveats in Wall of Force is 'the wall (hemisphere, in the case of this spell, of course) must be continuous and unbroken when it's formed. If its surface is broken by any object or creature, the spell fails.'
- A creature grappling you is an obstacle to a hemisphere of force appearing around you. It's certainly in the way of at least a part of that effect. Ergo, the spell fails.

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It creates a dome around the caster. It doesn't push things away from the caster. IMO it would create a bubble around both grapplers.
Hmm, yes, this answer can also be correct, depending.
Firstly, remember that a spell effect like this must radiate from a corner of the caster's square.
If the grappler is Medium or smaller, and the chosen corner will include the grappler in the 5-ft radius of the sphere, then Tiny Coffee Golem is correct. Congratulations! You've just bought yourself a one-on-one fight!
If the grappler is Large or larger, or the chosen corner will not include the grappler in the area of effect, then the spell will fail, as some portion of the grappler's body will be interrupting the intended border of the spell effect.