There’s a theory that in general mothers love their kids whether or not they love the father, but fathers are more apt to love their kids a bit more conditionally on whether they love the mother. I’m female (and a mother) so dads feel free to disagree.
In my case, my ex-wife and I had a daughter that I did not see for 18 years. The divorce was bitter, and we certainly had no love between us. When I reunited with my daughter when she was 18, she quickly became a very important part of our family and was deeply loved by all of us until her recent death at the age of 36. COVID. I'm not suggesting the theory is wrong, but I think there are far too many other factors that preclude such a broad conclusion.
As for this story, it truly breaks my heart, having so recently lost a child. Losing three at the beginning of their lives is beyond anything I could imagine.