Large Inheritance - Best path forward?

My wife’s father recently passed away. Her mom died over 2 decades ago and her father remarried and signed a prenuptial agreement with his new wife. My wife is the sole heir to his fortune (over $3M in cash and investments). We have some debt that we are going to pay off (related to a small business) and we plan to create a charitable foundation related to my wife’s business. The business is in a sector that charities, businesses and individuals like to donate to (childhood education).

I have a full time job that is able to pay for our mortgage, food, clothing and some vacations. Our mortgage rate is low (2%), so we don’t intend to pay that off as we can make more investing the money.

We plan to speak with a financial advisor as our goal is to keep the bulk of the money invested and as necessary pull some money out for expenses, home repairs and the like, and help supplement our income as we enter retirement in the next 10-15 years with the hoof eventually handing the money over to our children when we die.

Any other recommendations or advice? Anything that we should or shouldn’t do?

Location: FIL was in Missouri, we are in Virginia.