Subject
Twins
Siblings
35
Brothers
32
Psychology
31
Mistaken identity
26
Sisters
24
History
14
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
Soldiers
4
World War, 1939-1945
4
Conduct of life
3
Effect of environment on
3
Floods
3
Genetic aspects
3
Human beings
3
Identical twins
3
Identity (Psychology)
3
Imagination in children
3
Methodology
3
Missing children
3
Multiple pregnancy
3
Mystery and detective stories
3
Religious aspects
3
Schools
3
Sibling rivalry
3
Toddlers
3
African American women
2
African Americans
2
more ...