For this issue ,May I express my opinion about who will have a responsibility ?
Actually the sons an daughters have to do all of their abilities to response for this problems and will not proceed the responsibility to brothers and sisters except they cannot find the ways. And the lessons to learn for this issues is that everybody have to prepare enough money for they retired life when they will not have any income or they cannot work.The more years you live after 60 years old ,the more you have to prepare. Anyway finally this problems the brothers and sisters will solve but I don't want to have this problems make our family becomes un unity or ask for anybody wrong? This all I want to say as the third generation of this family who was passed the time when we are loved, enjoy, and happy together for more than thirty years.