Get a lawyer. When my son-in-law set up his business with two partners, I urged him (Told him/Directed him)to see a lawyer who specializes in that sort of stuff. After the meeting, he came back to me and said "Damn you!" I asked what was the matter. He said "The lawyer made me feel like a fool. He kept asking questions I couldn't answer, that I should have considered." Long story short, the lawyer drew up an agreement that all have now signed. BTW, I'm not a lawyer, but I did stay at my daughter's house last night.