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They were. They might again. Since they're dead, they are a part of the underworld.
I think so too.
I think, in a way? They are. They're stuck in a sort of purgatory, and haven't shifted back to this plane of existence. Something about traveling through the Quantum Realm stabilized those of us mistakenly transferred there.
I thought about asking Gamora. But being able to learn how to use the Soul Stone in a very short amount of time, without any catastrophic consequences for the current living? That's another risk. I think she's had plenty of time to settle in, and I'll reach out to her soon to talk about it.
Summoning the Barton family's souls is the route we'll have to go, to communicate where they could be picked up. I think you can act as a telepathic tuning fork, while I focus on the ritual.