Twins Siblings 35 Brothers 32 Psychology 31 Mistaken identity 26 Sisters 24 History 14 Gehiago ... Shipwreck survival 12 Bobbsey Twins (Fictitious characters) 10 Nature and nurture 10 Shipwreck victims 10 Families 9 Survival 7 Child development 6 Death 6 Infants 6 Research 6 Brothers and sisters 5 Child psychology 5 Family relationships 5 Hispanic American families 5 Magic 5 Man-woman relationships 5 Multiple birth 5 Criticism and interpretation 4 Exploration 4 Family secrets 4 Fathers and sons 4 Inheritance and succession 4 Social aspects 4 gutxiago ...