Eligible Dependents
You HSA can also be used for expenses for an expanded list of dependents, not just those eligible for coverage under your Health & Dental plan (i.e. spouse, children).
This includes grandchildren, parents, grandparents, siblings, aunts, uncles, nieces and nephews of you or your spouse, if the following applies:
They are dependent on you for financial support and are claimed as a dependent on your tax return,