I don't want to pay for two accounts

To avoid paying twice while keeping the same email addresses and domain, the key is to keep only one Microsoft 365 subscription active and cancel the other, because canceling a subscription does not delete the Microsoft account or email addresses.

From the context provided:

1. It is supported to have both a business plan and a personal/family plan, but it is not required. A single plan can be enough if it meets all needs. For example, personal/family plans are often used to keep personal files and family members separate from business data, but this is a choice, not a requirement.
2. Canceling a Microsoft 365 subscription does not remove the underlying Microsoft account or email address. The account remains; only the paid benefits (apps, storage, etc.) tied to that subscription stop when the term ends.

Based on that, the immediate, low‑risk approach is:

1. Decide which subscription to keep
   • If the GoDaddy‑based business domain and mailbox are critical for business, keep the Microsoft 365 subscription that is tied to that domain so there is no disruption to the business email and domain configuration.
   • Keep the Family plan only if its sharing model and features are needed for the rest of the household; otherwise, it can be canceled and the family members can continue to use their Microsoft accounts without the paid Family benefits.
2. Cancel the extra subscription (but not the account)
   • Sign in at the Microsoft account portal for the subscription that should be canceled.
   • Go to Services/Subscriptions and choose the Microsoft 365 plan that should be stopped.
   • Use the Cancel option for that subscription.
   • This stops future billing but does not delete the email address or Microsoft account itself.
3. Keep accounts and addresses, even with one suite
   • The family members can continue to sign in with their existing Microsoft accounts (for example, Outlook.com addresses) even if the Family subscription is canceled.
   • The GoDaddy‑hosted business domain and mailbox continue to function as long as the Microsoft 365 subscription that is bound to that domain remains active and the domain is kept renewed at GoDaddy.
4. If both plans are still needed logically
   • If there is a strong need to keep personal/family data and business data separate, it is supported to keep both a business subscription (for the GoDaddy domain) and a personal/family subscription (for home use). The documentation explicitly notes that in some cases having both is the correct decision, especially when sharing Microsoft 365 Family with people who are not part of the business.

In summary: choose which subscription provides the most important services (likely the one tied to the GoDaddy business domain), cancel the other via the Services/Subscriptions page so billing stops, and continue using the same email addresses and domain under the remaining active subscription.

References:

• What's the difference between Microsoft 365 plans for home or business
• Switch between Microsoft 365 subscriptions
• I am paying for two subscriptions - Microsoft Q&A