That's where it becomes tricky.
First of all, you need to understand that Indiana is an "at-will" employment state. At-will employment means that without a contract, you have no contractual or other right to employment with the company. The company is entitled to fire you for any reason: a good reason, a poor reason, or no reason at all--as long as the company does not fire you for an illegal reason (race, gender, age, religion, etc...). But it extends beyond firing, to hiring, promotions, demotions, wage cuts and raises, disciplinary actions, and even scheduling. Unless you can show that this was done in violation of a contract, union agreement, or a clear violation of an unambiguous and binding clause against the employer, or that it was done because of some minority status (age, race, gender, religion, disability) that you have, then they do have this discretion. Indiana does not have a "political retaliation" law, so political affiliation, how you voted, etc... is still something that discrimination against you could be legally based on.
Now if one owner that has the same authority to hire/fire as another says you're fired, and the other one says you're not, it's pretty much a stalemate. Now you can still go and file for unemployment if you want to. Or you can stay there until they're both in agreement. Technically you're "fired" but "rehired", and so long as one of them says that you're hired so long as he (or she) says so, then that's going to be the case. If she has a problem with that, tell her to take it up with her brother. Now you can still file for unemployment because you were fired due to no fault or misconduct of your own. But that's entirely up to you. Frankly I would want to get some definitive answer from them whether or not you have a job prior to filing for unemployment just so you wouldn't have any issues that might come up at a later point with the unemployment process.
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable.
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Thank you, ***** ***** luck to you!