FlyerTalk Evangelist
Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: BA Silver, TK E+, AA PP, Hyatt Globalist, Marriott LT Plat, Hilton Diamond
Posts: 13,053
You must call Hyatt to book suites using points.
For SLH, it's best to assume that you can't have additional guests in the room, but you could call the hotels and ask whether they charge for a rollaway bed or children. If OK, then you'd just book for two adults online.