When I left home to explore life & to work at various jobs, my father and I were not on the best of terms. My younger brother was still at home for a while, though he'd didn't get along well with Dad either. A couple years later, he started his own independent path, though he continued to live closer to where we'd grown up. For that reason he had more frequent contact with Mum & Dad.
Several years after I'd been settled for a while in a congenial locality, my brother came to visit. A day or so, after a lot of free and easy conversation, joking, and just enjoying each other's company, at a quiet time my brother found opportunity to discuss family matters. Among other topics, he related that he'd recently had one conversation with Dad when he'd admitted that, when he and Mum had married, he didn't want to have kids... but she did. Actually, this wasn't so shocking to me, it was more like a flood light turned on. It explained a lot of things.