The Evolution of Fatherhood

I am currently a preceptor for a class I took last semester called FSHD150B1: Men, Fatherhood and Families: A Bio-cultural Perspective. It is an awesome class about the unique state of fatherhood in humans. Even within the Family Studies major, we tend to only look at the social aspect of fathering in terms of parenting or child development. But what is overlooked is that the degree of fathering we see in humans is relatively unique compared to other species, including our closest relatives, the great apes. The professors for this class are primatologists so they bring an anthropological and evolutionary perspective to explain when, why and how human fathering came to be what it is today and to explain the function of fathering. 
The 'bio-cultural perspective' that they are referring to in the title of the course is actually the basis for understanding fathering in this evolutionary approach. What this means is that it is necessary to look at the interplay between biological and socio-cultural factors, biological meaning the physical adaptive functions and mechanisms, and socio-cultural meaning the different practices of different human groups. Following from this, the professors teach the students to use a comparative method with three dimensions: culture, species and time to understand the function of human families/fathers. The first dimension, culture is important because comparing across different human groups can tell us something about what is universally human. Comparing across species on the other hand, can tell us what is uniquely human interms of families and fathers. Finally, the time dimension can be useful in telling us when and why human families/fathering appeared in the course of human evolution. 
I would like to know what others think about this evolutionary perspective of fatherhood. Do you think it is insightful? Confusing? Interesting? Unnecessary? Drop a comment and let me know what you think!
If you need a Tier I Indiv. I highly recommend this class (it also fills the Bio/Human Behavior requirement for the FSHD pre-major!)