Haha! Yes, I know I was going to trip on that one. Let's just call it natural for convenience sake, because we've been doing it for some 30,000 years, give or take. Factually, it's not natural. It's just as natural as being civil.
Family ties are still as important today as they were back then, which is why people ought to think more about their children and their mental health when they decide to part ways for their personal greed.