First the cash would be deposited to corporation as a loan from shareholders. As the sole shareholder, that would be me. Anytime the corporation pays me part of that loan back (including interest) it is tax free to me.
750k would used in the highest interest market possible, and I would let that sit and accrue for five years before planning on disbursements.
Take 100k to pay off Mom's house, renovate it, and park a new car in the garage, and fix her current ride to be her knock around car. Finish the paperwork on her NPO, so she can get paid for her volunteering. Set up a grant to pay that NPO 10% of my company's gross.
Implement my community renovation project which I have been shopping for investors, I would just be my own investor. The project would easily replace my current income and I would be doing something for the love of it, not just because of the pay. (100k)
I would renovate my own place, get a slightly new car (off lease, one year off the lot, less than 10k miles) that is great on mileage. Once the first set of houses from the project are finished, I would move into one until the project is done. (50k)
By the time the project is done... I can decide if I want to cool out and draw interest or start another project.