Okay, so here's another revised list:
Chrom/Olivia (Passes down Galeforce, AGAIN~)
Sumia/Frederick (Passes down Galeforce and Aegis, AGAIN~)
Cherche/Vaike (Passes down Dual Support+ and Counter)
Cordelia/Stahl (Passes down Galeforce and Aegis, reclass to Dark Flier for Galeforce)
Miriel/Ricken (Passes down Lifetaker and Prescience)
Sully/Donnel (Passes down Aegis and Aptitude)
Maribelle/Henry (Passes down Galeforce and Vengeance)
Tharja/Gregor (Passes down Vengeance and Wrath)
Nowi/Gaius (Passes down Deliverer and Sol, reclass to Dark Flier for Galeforce)
Panne/Kellam (Passes down Deliverer and Pavise)
Thing is, I now have three routes: Lissa/Lon'qu (Passes down Galeforce and Deliverer)
Serah/Libra (Passes down Galeforce and Renewal)
OR Lissa/Libra (Passes down Galeforce and Renewal)
Serah/Owain (Passes down Dual Support+ and Galeforce)
OR
Lissa/Lon'qu (Passes down Galeforce and Deliverer)
Serah/Owain (Passes down Galeforce, father's skill to pass still not determined)