yes, per the horse's mouth:

We determine membership by aggregating assets of all eligible accounts held by the investor and his or her immediate family members who reside at the same address, including investments in Vanguard mutual funds, Vanguard ETFs, annuities through Vanguard, The Vanguard 529 Plan, certain small-business accounts, and employer-sponsored retirement plans for which Vanguard provides recordkeeping services.

Paul