Part Family members are like any other component. If they are not there they won't be loaded. So either generate new ones or go to your assembly and delete them like you would any other component.
John R. Baker, P.E.
Product 'Evangelist'
NX Design
Siemens PLM Software Inc.
Cypress, CA
It appears that the family parts do not like to moved around in the assembly manager from parent to parent. The delete suggestion and regenerate worked great. Again thank you.