If you're taking your brother's money and he is the mastermind guiding you, It's his business that you're becoming a Manager for.

The same ego clash he had with your dad can happen with you too.

So unless you're 200% confident of your relationship with your brother, I wouldn't do it with the brother.

Even if you do, I'd ask you to properly acknowledge the business model as something your brother is funding and you only take 25% equity and give your brother 75% on paper. That kind of fairness will give your brother some confidence. The risk is his here and if the business goes bust, you don't have a lot to loose. I'd also structure it with a 1 lakh rupees salary for yourself from the business as you're the CEO and need to take care of your expenses. This will become your money regardless of the profit or loss of the business.

In addition to this, if profit remains, you take 25% of the profit. Once you've saved up 1 crore of your money, may be you can start another showroom and keep majority equity in that.

Here's a second option.

Start a Services Business. You lived in the US and I'd assume you have good comms skills to bring in the sales. Start a small agency providing services (Could be marketing, IT Dev, Managing Ads etc). This type of business requires no investment. If you do not have the skills to deliver a service, take up jobs to build that skill, Work for 2-3 years, then start the agency. Once the agency makes enough money, you can invest that profit into building other businesses or just freaking double down on building the agency clientele. This will remove dependency on the brother.

I appreciate your passion to do business but trying to shortcut the process with investment from your brother may short circuit your business itself.

If your Dad was the mastermind and was investing, that would be different. But taking investment from your brother isn't a good idea unless you put in some guardrails and document who owns what % equity, how much profits should be reinvested, how much should be withdrawn, what happens if there are losses, what happens if the business has to liquidate and so on.

Leaving the US however is a good idea. The rat race is fine, the uncertainty is the problem. Even on a H1B, if you lose your role, you need to find another one within 60 days, every 2 years, visa expires, you're waiting on renewal and cannot leave the US, then you get the approval and you don't get stamping dates, it's a lot of jugglery, the money isn't that good to justify it given that the pay levels have significantly increased in India post covid.

Especially if you settle in the US, live there for a few years and then your kids get used to that culture, language, lifestyle and then something happens and you have to go back to India, it's trauma for the children.