If A Husband And Wife Are Named On A Lease Agreement, But The Husband Does Not Sign The Lease, Is The Contract Non-binding?

My daughter and husband were going to lease an apartment. My daughter signed the lease, that was in both her and her husbands name. She gave them a deposit. They changed thier minds and would like there money back. If her husband is named on the lease but did not sign it, the lease should be non-binding and they should get a refund of the deposit. They never moved in. I feel this fails to meet a meeting of the minds,which is required for a legal contract. Is this right and is there case law for it?