Chris Watts appeared to be an attentive dad. We see him reading to his kids, horsing around with them, cutting their hair, blowing hot food to cool it down, even taking cake in the face while Shan’ann and and his mother-in-law looked on with a camera.
He also dressed up as Santa and took direction from Shan’ann in playing that role for them. So at face value, he seems to have a much closer bond with the children than with Shan’ann.
If he murdered his children, why did he?