I really appreciate everyone's reply here, whether it is negative or encouraging - I want to see opinions.
To be clear, i wouldn't just be using this money as an investor, I would actually be building a company with the family, and if successful become a partner. The kick is, if the company profits the first year, the family will invest an additional million and every year thereafter. For everyone asking what the families goal is - it's to build liquid capital quickly.
The son is a real estate analyst that graduated from an ivy league school, hes bright but has 0 experience managing contractors or with construction. The mother was a big developer in the country she moved here from. Both have valuable skills. My role in this would be to help identify deals, strategy and manage contractors.
Thinking about this longer i believe the best strategy may be a combination of 5 flips in the 250 arv range and a couple new construction deals. I believe this would provide the quickest and largest ROI if done correctly.
If I don't take this opportunity, I might regret it forever, even more so than if I take it and fail.
Erase everything you know about the situation from your mind... Someone is giving you a million dollars to build a company and invest for a quick ROI, what's your plan?