Hello Aditya, and thanks for your post.
You didn’t mention which specific type of MBA program you are interested in, though I assume you are targeting full-time programs. However, have you considered a part-time program? They tend to be more for slightly older applicants, as opposed to full-time programs where the average age is closer to 27. You could look into other types of programs too, including one-year programs which also skew older. No matter what program you choose, the application process is truly holistic, and committees will look at your stats (GPA and GMAT/GRE), work experience, and extracurriculars.
You will definitely need to show your quant skills, so a solid test score is important. If you don’t achieve your target score, you may still want to illustrate to the schools that you have the academic ability to succeed in the classroom. You could showcase your quant ability in your resume, your recommenders could do the same in their recommendations, or you could even take a supplemental course such as stats or calculus.
It is hard to gauge your work experience without knowing your accomplishments and impact you have made there. You will also have to mention what you have been doing for your family business over the last couple years. It’s important that you show your impact there. Ideally this will be supported by strong recommendation letters (perhaps from a client, since family members can’t write you one). It will also be important to explain why you want your MBA, and to also illustrate the skills you already have which are transferable to your goals. Be sure your story makes sense, and is realistic and specific.
Regarding extracurriculars, make sure to really emphasize your leadership roles you have taken on, and ideally mention some which are more recent than college.
In general, I suggest apply to several schools, including reach, target and safety. And unfortunately, I do not believe schools offer tuition assistance to someone with a specific condition, but depending on the school, they offer either needs-based or merit-based scholarships.
Good luck!