Investors are frequently people with a lot of imperfections, can be assholes, terrible dads/mothers or just happened to be born rich. They are just human beings.
Just talk to them like you typically do to anyone, you need their money, they need you to make money.
And always remember no matter what you do, very little is going to change despite the outcome and you are almost insignificant and is playing a very tiny part in the universe. You are just doing your own thing.