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Set your photos to be visible to only your friends or family (that is, not public). You can choose this option as you upload your photos, for individual photos already uploaded, by using the Organizr, or as the default setting for all your uploads.
Mark people as friends and family on Flickr. You can do this when you invite them or make an existing contact a friend or family by mousing over their buddy icon, using the arrow that appears, and changing their status. (If only it was that easy in real life. :P )
After you mark your family and friends and set the appropriate privacy level on your photos, your family and/or friends can see your photos under the "Contacts" link at the top of each page.
How do I share my photos with *just* my friends and family?