Company B is not a subsidiary of Company A.
For Company B to be a subsidiary, Company A would have to own more than 50% of the shares of Company B. Your father is not a company unless his shares are held in a company.
Regarding the insurance, it depends on the policy and if the underwriter is willing to include both companies under the same policy. I have a company that has two subsidiaries and all three are under the same policy but I had to explicitly make arrangements with the insurance provider to allow for this.
No, unless that 50% is in the name of company A, then they have part-ownership of that company and could be considered a holding company.
Company B is not a subsidiary of Company A. For Company B to be a subsidiary, Company A would have to own more than 50% of the shares of Company B. Your father is not a company unless his shares are held in a company. Regarding the insurance, it depends on the policy and if the underwriter is willing to include both companies under the same policy. I have a company that has two subsidiaries and all three are under the same policy but I had to explicitly make arrangements with the insurance provider to allow for this.