Answer:
My answer is a little long, so you will probably need to summarize it.
The ethical issue here is that you work for a company that is about to open a store that will make the price of your brother's house to plummet. Your brother has the option to sell his house right now, but if you tell him to accept the offer, you will be breaching your employment duties.
Is your duty towards your brother more or less important than the duty towards the company?
We can analyze both possible outcomes:
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You do not tell your brother and he does not sell his house. After the store is announced, your brother's house will decrease in value. That means that your brother will lose a lot of money, but you complied with the obligation of confidentiality that you have with your company. The downside is that once your brother knows about it, he will hate you for the rest of his life. And the hatred will probably not be limited to only your brother, most, if not all of your family will be very unpleased and terribly mad at you. Your family will probably wonder why your parents didn't abort you?, or are you adopted?, or do you simply hate humanity?
- On the other hand, you decide that you value your brother and whole family, and you decide to tell him to accept the offer. You will have breached your confidentiality obligation towards the company, but you will have literally saved your brother's financial situation, and you will have saved any type of relationship that you have with your family. Will the company be hurt by your decision? No, it will not make any difference to them. They are announcing the decision in just a few days, so anything that you tell your brother will not make any difference. Since your brother will try to sell his house, he will keep the information to himself, since telling other people will only ruin any possible sale.
If we follow the golden rule: do to others what you would like them to do to you, then obviously we should tell Owen about our company's plans. If we were Owen, that information would be really important for us.
If we follow virtue ethics, then it gets a little bit more complicated. Is telling Owen about the new store a virtuous action? Would a virtuous person do it? To be honest, I'm not really sure what exactly is a virtuous person.
What I understand is that virtue ethics is based on who you are, and not what you really will do. So, the question here would be: Are you a good (or virtuous) brother? Are you a good (or virtuous) employee? In this case, you cannot be a virtuous employee and a virtuous brother at the same time, so it depends on which you value the most. Going back to the possible outcomes, I would prefer to be a virtuous brother in this case.