I realise this is purely anecdotal so I apologise.
As a little girl my mum was a secretary and a very good one by all accounts, while my dad was a deputy head teacher, and my dad did everything. Mum was NOT a morning person and all my memories are of my dad getting me up, dressed, giving me breakfast, entertaining me. He obviously had me for holidays, and he really was the definition of doting dad - honestly, anyone can describe their husbands or partners and I can raise you ten. Pretty much everything I know, I learned from him: he taught me how to read, how to play the piano, how to speak French, a whole host of random historical facts and tried to teach me maths unsuccessfully. I really have yet to come across a more devoted parent and I've come across a few! He used to take me on country walks with him and carry me back as I'd get tired - anyway, rambling.
My mum retrained as a teacher because I think she felt a little jealous but to be honest I was still a bit closer to my dad.
Then when I was a teenager my mom was diagnosed with cancer: 3 months later she was dead. I was shocked and upset but if I'm honest with myself I wasn't devastated.
My dad completely lost interest after that. Wouldn't talk to me much, didn't spend any time with me, didn't show any interest in me. I was bemused and bewildered. He moved out to live with another woman and our relationship then was patchy at best (not on my part!)
I couldn't make any sense of it until years later when I read that men connect to the children via their mother, and that once the connection with the child's mother goes, so does any connection with the children.
If I'd known that I wouldn't have had children myself, as I do worry a lot about what might happen if I die as I don't expect my now ex to have them and we have no family. But they are here now and hopefully I won't die.
But it's why I agree with timely