Buying with family. Contract a must?

[Jonathan Santiago]

Hopefully looking to close on my 2nd deal within the next couple weeks and was able to get my dad to partner up with me which he has been dying to invest in property. So I am financing under my name and we are putting both our names on the deed. My question is, what kind of contract, if any, should we put together to protect both of us? Should we speak with a lawyer to help us draft one up? Still pretty new and looking to get some perspective from people who may have done similar deals in this way.