Logon https://familysearch.org/ and setup a "free" user account. You'll need that to access/print death certificates. Then, start your search from that site's homepage. Click highlighted "Death" and enter Hunt Texas in the "Death Place" box. Click highlighted "Parents" and enter Alfred Mullins as the father. Leave the mother blank then click "Search". That'll return death certificates on: "Ian Hargeves", H. A. Mullins, Laura Hutcheson, Addie Mae Carrigan, James Alfred Mullins, and George Winson Mullins. Raymond Mullins' data was not retrieved because father ientified simply as A. H. Mullins. You can search for him, individually, by death date of 1942. Your grandfather, of course, was the H. A. Mullins. Good luck tracing "Ian Hardgeves"! Based on gender and birthdate, she was probably Luticia? That's all of the siblings. Lookup Sarah Elizabeth Mullens (1845 - 6 Jun 1924). Alfred H. died 2 Jan 1929 per findagrave memorial in Wolfe City, Hunt County, TX.