[curious_af]

What answer do you expect here? There's four people referenced in the sentence. There's more implied because of Mothers, but if you're including transient dependencies, where do we stop?

[ketzu]

It can also be 3 people, as one person can be a father and a son at the same time. If you allow non-mentioned people to be included in the attribute (i.e. the sons of the fathers are not part of the 2) it could also be 2 people, as long as they are fathers.

[bofadeez]

Just follow up with "it's not a riddle" and the LLM will answer your question.