Ask HN: Need advice on tricky situation with investor

First time poster, long time lurker.

Our startup took on an investor right before we launched who owns 30% of our company. He gave us the money with no contract and nothing in writing detailing any terms (all the email says is you guys get X amount in exchange for 30%.)

We're in the process of trying to sell our company, for only slightly more than he originally put in. I was wondering if he is entitled to first money out or rather just 33% of the sale price.

(Also I'm aware that verbal contracts hold up in court. These details have never been discussed verbally or through emails.)

Thanks