1. Much will depend on whether house in her sole name or joint.
2. If joint, do they hold equitable interest as "beneficial joint tenants" or "beneficial tenants in common"? Latter means separate shares in property's value.
3. Irrespective of above, Court can make property adjustment order between them- so deeds aren't conclusive.
4. URGENT: the father should take immediate legal advice, to avoid house being sold by wife alone (if it's in her sole name) or to avoid it passing to her (if he dies whilst they hold as benefcial joint tenants).