You are able to add additional co-signers to your contract.This means your contract will be sent to two recipients (on the client's end) and they will both need to sign it independently.
​
Locate the drop-down option to add a co-signer on the righthand side of your drafted contract.

Once you've togged down to 'Recipient with Co-signer Signature', you'll see a secondary signature block in the signatures section at the bottom of your contract.

When you sign and send the contract, you will be prompted to fill in the co-signer's email address (the client's email address will be auto-populated).

Once the client and their co-signer sign the contract, it will display both signatures on the final contract.