If I have a family iCloud account can the others see my photos?

Not unless you share the photos. See the following from Share iCloud+ with your family - Apple Support

When you share an iCloud+ subscription, everyone in the family group uses their own account. That way your photos, documents, and other information stay private, even though you're sharing access to the service. You simply share the features and space available in iCloud+ with your family members, so you only have one plan to manage.

If you want to share photos, see: How to use iCloud Shared Photo Library - Apple Support

or How to use Shared Albums in Photos on your iPhone, iPad, and Mac - Apple Support