The school cannot fix the home life, so it should not try.
Home life should be addressed by child services, etc. Granted in reality they are often as understaffed or as incompetent and corrupt as any other government service, but at least that's their mission. School teachers should not be doubling as social workers.
I personally suspect that it would work better if schools had dedicated staff to deal with that side of stuff rather than only having those people in the separate child services organisation - maybe in such a way that it's the school social care team who directly work with the children & families (with a separate team at child services to do the same for any kids not attached to a school), while being able to call on support from central child services for either advice and guidance or for the use of an expert in a specific area when needed.
But underfunding is a big problem whichever way it's structured, and I of course agree with you that it's not something you can just say "this is the responsibility of the teachers to do on top of their existing responsibilities".
Home life should be addressed by child services, etc. Granted in reality they are often as understaffed or as incompetent and corrupt as any other government service, but at least that's their mission. School teachers should not be doubling as social workers.