We have been unable to find rooms in or around Redding that sleep that many but we have stayed at the Best Western Hilltop Inn, it is right off I-5 and we have been able to get connecting rooms when me made the ressie's early enough. It is located near many places to eat, always clean, nice pool and a GREAT hot breakfast. Join Best Western's Travel Club, Its Free, for discounts, etc. Best of luck.
Jack