Due to the fact that Bleama's death certificate makes no mention of a son named Morris, I have to conclude that he is from Lazar's second marriage, and is thus a half-brother to the other four Shear children. I suspect that his mother's name was Esther, based on a Lezar Shear (d. 1952) listed in an index of deceased persons in the Transvaal Archives Depot.
I am not aware that Complete Death Certificates in the former Transvaal mentioned such a comment of descendants. Are the other children listed? Please do send the source to authenticate this remark. Will you provide the precise site for perusal of your further findings for the Transvaal Archives Depot since there are multiple and unreliable archives? On a particularly cautious note with this finding, there appears to be variants in the name Lazar, thus may lead to two separate individuals.
I have uploaded a page from Bleama's death certificate to her Geni page. You can review it for yourself there. I am basing my belief that Morris is the son of a second wife named Esther on the following document: https://familysearch.org/ark:/61903/3:1:3Q9M-CS92-CS4K-R?i=436&...
Now that your certainly was fairly conclusive, I did some of my own research in addition to your own
where I was informed of (Lazar's/ Lezar's) second marriage, consequently I deem this evidence substantial enough to consider the findings accurate. I examined Bleama's Entry of Death as well as other records and it appeared misleading as I cannot find any evidence of her Entry of Birth with the name and surname being Bleama Fisher, respectively. I have high speculations that she was not born in Manchester unless she entered under a different name. My finding was based on a subsidiary recommended by Her Majesty's Passport Office.