Movie poster truth: 0%. I suppose I could stretch to 5% truth on the grounds there was a spider and a bed in the movie, but no more than that. I’m not even certain there’s a great deal of truth in the IMDb write up for it, either.
By ‘a family’ there is certainly a mum and two kids, but the mum is neglectful and a barely functional drug addict. By ‘moving to a secluded mansion’ it means ‘moving to a house provided by the old man who the mum has been employed as a nurse by’. By ‘an entity taking the shape of a giant spider’ they mean ‘an actual giant spider’.
Running alongside the storyline of how PTSD causes opioid addiction and how that results in what is essentially domestic abuse is a subplot around a stolen artefact full of giant spider. Oh, and it gets loose, blah, blah, blah.
But the important thing is that a mother’s love is stronger than all the other bad things that happen. Apparently.