In Poland, the rule is that basically if you and sibilings can afford to pay for the nursing home of your parent, there is no state assistance. The state only kicks in if the family is too poor to cover the costs. The rationale behind it being probably that caring for parents is the responsibility of family, not state.
Does the state expect children who have emigrated to also contribute toward those costs? I know many younger Poles have moved to other EU countries for better job opportunities.