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.
Matagorda County. (Bay City) - Situated where the Colorado River empties into the Gulf of Mexico, Matagorda County is home to miles of glistening, sandy beaches, pristine waters, world-class fishing, and diverse wildlife. In fact, if you like being in and around the water, you may never run out of things to do.