Hi, There is a Namauu, Moore, Diamond Ohana et al Family Tree at trees.ancestry.com/tree/31328174/person/12425106385 which has some information about your family.
I checked Ancestry and FamilySearch but didn't find much. Hawaii's public records don't go public until 75 years after the event unless you are the parents, descendants, spouse, legal guardian and individuals who share a common ancestor (i.e., cousins, grandparent, aunts/uncles). For additional info go to http://hawaii.gov/health/vital-records/vital-records/index.htmlhttp://hawaii.gov/health/vital-records/vital-records/index.html.
I didn't find any death information for Alfred. I don't know if Vital Records will search over a couple of decades or not but the above URL takes you to their web site.
A Jessie Carvalho Born: 2 July 1892 Location where Soc. Sec. received death information from: Hilo, Hawaii, Hawaii Died: Nov 1970 Her soc. sec. # was assigned in Hawaii in 1962. Source: Social Security Death Index.
You might want to order a copy of her death certificate, however, a copy of her obituary should be helpful and list where the children were living in 1970.
Do a whitepages.com search for the Hilo Public Library.
A Herbert William Carvalho Born: 6 May 1913, Hawaii Died: 2 May 1986, Alameda Co., California Mother's Maiden Name: Benfo [might be a typo for Bento) Source: California Death Index 1940-97.
Contact the Alameda County Library, http://www.aclibrary.org/http://www.aclibrary.org/ for a copy of his obituary (if one was published).
I didn't find anything for the rest of the children. Vital Records might be able to help you with the girls married names. Successful Searching!