Since you asked, I do think it is odd that your grandchildren sleep with you if you have other accommodation available for them. Also, a nine-year-old should be able to bathe or shower alone. I would worry more about lack of independence at that age than anything improper, but at age 9 I would expect a boy to be more modest than you are describing.
Free printable topographic map of Morro Bay (aka Moro Bay and Bernard's Bay) in San Luis Obispo County, CA including photos, elevation & GPS coordinates.
The San Bernardino County Sheriff's Department (SBCSD), Morongo Basin Station, is responsible for law enforcement. throughout the Morongo Basin. Both Yucca Valley and 29 Palms contract with the sheriff's department for police services. The 188,000 acre Johnson Valley OHV area is located 20 minutes north of Yucca Valley.