Awakening

Chrom and Lucina

Three Houses/Hopes

Dimitri and Edelgard

Fates

Corrin and Azura

Shadow Dragon, Mystery of the Emblem

Marth and Elice

Blazing Blade, Binding Blade

Eliwood and Roy

Three Houses

Seteth and Flayn

Ephraim and Eirika

Marth and Caeda

Blazing Blade

Nils and Ninian

Blazing Blade, Blinding Blade

Hector and Lilina

Sothis and Rhea

Awakening, Fates

Owain and Lissa

Genealogy of the Holy Way, Thracia 776

Leif and Seliph

Genealogy of the Holy War

Arvis and Deidre

Alm's grandfather, Mycen, raised both of them. 

Alm and Celica

While not all Fire Emblems take place in the same timeline and universe, there have been several relationships that have spanned multiple games in the series. Can you identify the relationship between these two characters? 

(Be prepared for some incest.)

English

How Are These "Fire Emblem" Characters Related? [SPOILERS]