Relatedness

1. Reproduction

1.1. Direct Fitness

1.2. Indirect Fitness

1.3. Inclusive Fitness

2. Kin-Recognition

2.1. MHC gene

2.2. Rule-of-Thumb model

3. Familial Interactions

3.1. Sibling Rivalry

3.2. Altruistic Acts

3.3. Haplodiploid systems in Hymenoptera