Table 1 Classification of all 15 genetically feasible family types for nuclear families each with a single affected child, together with the conditional probability of each trio, given that the child is a case

100

1

N ₁₀₀

101

1

N ₁₀₁

201

1

N ₂₀₁

211

1

N ₂₁₁

212

1

N ₂₁₂

010

2

N ₀₁₀

011

2

N ₀₁₁

021

2

N ₀₂₁

121

2

N ₁₂₁

122

2

N ₁₂₂

000

3

N ₀₀₀

110

3

N ₁₁₀

111

3

N ₁₁₁

112

3

N ₁₁₂

222

3

N ₂₂₂