The correct way to fill in the blank with the word in parentheses is the following:
We'll stay here until our father returns tomorrow.
- The sentence we completed above is expressing actions that will happen in the future.
subject + will (future) + main verb + until + subject + simple present.
- One action will continue to happen until another action takes place.
- Since the second action is in the simple present, we must pay attention to the subject.
- "Our father" is a third-person singular subject, which means the verb must be inflected.
- Therefore, "return" becomes "returns" to agree with the subject "our father".
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