Thanks. I had called the Hilton Hawaiian Village Beach Resort and Spa and their manager told me max of 3 rooms per HH member concurrently a night. and yes, i'm sorta staying in all the rooms - family members, but booked under my HH account and name.

I'm doing the MVP promo - 4 stays or 9 days within a 90 day period. Are you sure the tally resets to 0 when crossing from Dec 31st to 1st even for this promo? I dont see it saying the 90 day tally resets if interrupted by new year.
https://www.hiltonhhonors.com/landingpages/mvp.aspx