Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
A Microsoft 365 Personal subscription is enough for this scenario.
Microsoft 365 Personal is for one user but allows installation on all devices and being signed in on up to five devices at the same time. This includes any combination of PCs, Macs, tablets, and phones, so using it on 2 phones, 1 desktop, 1 netbook, and 1 tablet is supported.
The Microsoft 365 Family plan adds the ability to share the subscription with up to five other people, but is not required if only one person needs to use the apps.
When the current Family plan comes up for renewal, it can be switched to Microsoft 365 Personal without losing the ability to use Office on five devices at once.
References:
- What happens if I add another Microsoft 365 for home subscription to my account?
- When do I need a Microsoft 365 subscription?
- What's the difference between Microsoft 365 and Office 2024?
- What's the difference between a Microsoft 365 subscription and free web apps
- Sign in to Microsoft 365
- Manage Microsoft 365 Family subscription sharing
- how to download microsoft office 365 from subscription with multiple installs - Microsoft Q&A
- Is there a device limit on 365 Family installs? - Microsoft Q&A