An action benefiting both actor and recipients can still satisfy Hamilton's rule (rb > c) and be selected as genuinely altruistic when recipient benefits are sufficiently weighted by relatedness.

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Actor(as used in ethical discussions): In this context, the person who is performing an action or doing the helping.
Altruistic(as used in ethics and behavior): Doing something helpful or kind for another person with no expectation of getting something back in return; putting someone else's needs before your own.
Hamilton's rule(as used in evolutionary biology and ethics): A mathematical formula (rb > c) used by biologists and philosophers to predict when an animal will help relatives even at a cost to itself; it says that helping is worthwhile if the benefit to relatives (weighted by how closely related they are) outweighs the cost to the helper.
Relatedness(as used in evolutionary biology and Hamilton's rule): How closely genetically related you are to another person; the more genes you share (like siblings sharing 50% of genes), the higher the relatedness.

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