The article I read was also tragic but I think the knee jerk blame of social services here is problematic. The mother argued with the father "before Christmas" and moved out, leaving her two year old with a father who was 60+ and known to be unwell. She appears to not have made any contact or raised any alarm, and the pair were found dead Jan 9.
The social worker reported to police on Jan 2, revisited on Jan 4 and reported to police again, and eventually it was the same social worker on Jan 9 who got hold of a key and made entry, the police having done precisely nothing.
It seems to me social services are the only ones who actually did do something. When was this mother thinking of contacting her ex partner or enquiring about her little boy? I find it absolutely shocking on her part.