Generally no, all communication between husband and wife is what is called Spousal Privilege that states one may not force a wife to testify against her spouse. However, the Spousal Privilege may be breached by an exception to the rule.
A parent company is a company that owns enough voting stock in another firm (subsidiary) to control management and operations by influencing or electing its board of directors. A parent company could simply be a company that wholly owns another company.
The individuals then become shareholders in the holding (parent) company, and the parent company owns the shares in each of the original companies, which then are subsidiaries of the parent.   Indiviuals own shares in parent. > Parent owns shares in each subsidiary.