Let's define «relevant» in this case as those documents put in front of a witness by opposing counsel during a deposition. (radicalconcepts.com)
A domestic contract must be in writing and signed by you and your spouse in front of a witness who must also sign the contract in order for it to be enforceable. (nelligan.ca)
Now you just need to get it formatted and properly signed in front of witnesses. (rocketlawyer.com)