But if we continue, let's suppose that A came from the father as normal, and the B is the same as the mother's C . So, the father contributes A to his son, and the mother contributes C to her son, we simply rename the C to B in our original setup. It all works out. While causal loops seem to have several problems at first glance, there are ways of explaining those problems away. After all, causal loops can sometimes make more sense than normal causality.
Historians spend a lot of time trying to figure out exactly what caused some event to happen.
And as soon as one historian has shown what caused an event, another historian will refute it. At least with a causal loop, it is clear what caused it to happen. It caused itself. Actually I didn't write it. I needed an essay about time travel, and I woke up one morning and this essay was just sitting on my desk.