Go to RoseHills.com, click on "Service and Grave Finder" and put their name, last name first in "Search for Obituaries and Grave Locations". Make sure the "Grave and Interment Locations" dot is blue. If you're going to the cemetery, park inside the main entrance go into the building on the right and the people at the desk will help you.
If your family member has passed, try what Bob suggested. If it turns out they're not at Rose Hills, u might try gravefinder.com .
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