generational typology

no that difficult people, the only thing you learn from this is what family members are involved, and how they support other family members...you do not need to know orientation, why a certain member may not support another family member, or anything else. you just have to know the terms...
g1, great grandmother
g2, grandmother
g3, mom (usually teen)
g4, child
and a few other terms to get the concept.

*let me give you a scenario: the grandmother(g2) is angry at the mom(g3) for getting pregnant, so, the grandmother(g2) decides to support the child(g4) and not the mom(g3) there would be a solid arrow pointing from g2 to g4. as well as an arrow pointing from g3 to g4.
now! lets say because of that, the great grandmother(g1) is pissed at the grandmother(g2) for not supporting her daughter(g3), so the great grandmother(g1) chooses to support the mom(g3) there would be a solid line going from g1 to g3.

this is only one super simple situation to how a generational typology chart would look.
why then can't a class of college students grasp that concept?

'the family' was so frustrating tonight...it is not that hard.

*if you want more examples or want to give me an example to try and stump me, go right ahead.