First, the tort of intentional infliction of emotional harm usually involves outrageous conduct--and often with a physically damaging component as well--which would go far beyond restricting access to an aged, ill parent, even assuming that such had been done, as long as there was some valid reason at all for such restricted access. (e.g. too much of a strain on said parent) It really is very hard and rare to successfully make out this claim. Second, even if they could make out the claim, they'd then have to show facts supporting their claim--i.e. there'd need to be evidence of them trying to gain access and you denying or thwarting it (including that you had the power to actually deny or thwart it). In short, there is *very* little likelihood of successful claim for this being made out. That said, all lawsuits need to be taken seriously: if sued, don't ignore, but retain a lawyer and let the lawyer get rid of or defend the suit--and also countersue on your behalf, if appropriate.