You can control which family members receive the Daily Digest or the Weekly Digest in their profiles.  Just click on their picture in the “My Family” bar on the left, and click the “Edit profile” link at the top of the window that appears.  On the “Basic Info” tab of the “Manage Family” dialog that appears, there are two check boxes, right below the field for the email address, one for the Daily Digest and one for the Weekly Digest.  Checked means that family member will receive that Digest; un-checked means they won’t.