Strategic Partnerships

Investor and strategic partner wants to do similar/same business with his brother in 2-4 years whilst still being a partner with me

Hi everyone, my partner and myself are 50/50 owners in an Amazon private labelling and wholesaling business. I’m posting this for more insight and to hear your opinion as well as the reason behind your opinion on this matter. So my partner would like to do the same business that we are doing with his brother. Once again this would be the same as what we are currently doing, he would like his brother to work for us in our company then after he has experience and understands the business and how it works, he will go off and do a separate venture doing the same business with his brother, while we are still partners. In regards to both his and my role in this company - He’s the investor and strategic partner and I am head of operations for the company. Is this a red flag? Is this a conflict of interest and direct competition for our business? I understand that he wants his brother to succeed, I want his brother to succeed as well. From my side, when viewing this from a rational business standpoint now, I feel as this is not the most sensible decision for our company and partnership and isn’t something you should be wanting a business partner to do. What are your thoughts on this? Is this just an overreaction from my end? From his end, he just wants his brother to get into business, understand how business works and be successful in business which is completely understandable, and there are many products on amazon so he doesn’t see it as an issue and he definitely does not see his brother as a competitor to us. and thinks my overall picture is too small because there’s enough room for me, his brother and many other amazon sellers both private label and wholesale, In regards to market share. I agree with this and I want nothing but success for his brother as well, I just don’t think it’s fair or reasonable from my end in regards to spending a few years on this business, building software and systems, optimizing our processes then opening his brother to exactly how our business is running then him leaving to do it on his own whilst partnered with my strategic partner/investor. I would love to know what your thoughts are so I can look at this issue from an outsider's perspective rather than my own. Remember he just wants what is best for his brother and for his brother to be successful. What is your opinion on this issue? My concern with this is that this is a conflict of interest and this would be direct competition with what we are doing as this business model is fairly replicable if you know what you're doing, especially if you have the knowledge and understanding of our exact systems/software in place like he would. Since this is a fairly new business for us both, we are not too heavily invested in regards to investment and time at this point. What is the correct next step forward in your opinion? What is your opinion and why? And is this just an overreaction from my side or are my concerns warranted?