Having a good level of vitamin D will:

Extend the lives of your parents - at least 2 years

Reduce your parent's health and housing expenses -the final years with vitamin D are NOT the declining years

While vitamin D will delay getting it,

      less will be spent on health and housing,

            so you will end up getting more inheritance

(To further maximize YOUR inheritance, DISCOURAGE the siblings from taking any vitamin D)  

See VitaminDWiki

• Encourage your senior parents to take more vitamin D, you will get more inheritance
  Has links to: Falls and Fractures; Cognition; Extend life; Improve mobility; Reduce diseases