Jennifer, you might start by finding out where your grandparents were when they died, checking Social Security Death Index (online), and getting their obituaries and death certificates. Then you could check FamilySearch.org and Pilot.FamilySearch.org for censuses and other information. FSBeta is good, too, but some of that is contributed, undocumented information.
Google "1930 census" to get some information from other censuses. If you hold your cursor over the 1860 & 1910 census years without clicking, you can usually see names and ages of those in the household.
If you get back far enough so that somebody has contributed the information, you might find some information if you click Family Trees in the strip at the top of the RootsWeb page. Then click Advanced Search on the next page and fill in information for your family.
Whenever you post, be sure to include as specifically as possible who, what, when, where. Many records are held at the county level, so you should indicate the county where people lived.
Contact local historical and genealogical societies where you live and ask for help in filling out family group sheets and ancestral/pedigree charts.
Post whatever information you find about the deceased members of your family.