The 1930 census (and all censuses taken more than 72 years ago) have been released to the public and indexed. You may find this overview from the National Archives helpful: https://www.archives.gov/research/genealogy/census. Setting up a free account with, for instance, FamilySearch (https://familysearch.org) would enable you to search the 1930 census records as well as other troves of genealogical documents. Alternatively, we would be glad to take a look for you. If you would prefer that, please provide some of the following information (approximate info is fine): names, dates of birth, and location. Best of luck in your research!
Find the 1930 census for the state your ancestor lived in in 1930 on Ancestry.com (paid research site) or familysearch.org (free research site) and using the search box enter the name of one member of the household, approximate birth year, and state or country of birth (if known). This should lead you to the family in April 1930. If this does not work try searching for variations of the names or other members of the household. The information on censuses was collected orally, so names are often misspelled.