Possible Clues:

• The family determine it should be kept secret
• Send a client (anag) — covert
• Intend to pursue family in secret
• Family of French can emigrate finally, in secret
• Interrelated families set apart in secret
• Intend to understand family secret
• Intend tailing tribe in secret
• Fated, almost, to support family in secret
• Families design backroom
• Secret of ancients led to rupture