I think on the surface Sharif might be easy to decide on, he did confess multiple times after all so there isn’t much to debate. That will probably be an unanimous verdict.
The debate is likely about the other 2 defendants who had the wherewithal to not provide evidence, so the jury has to infer from somewhat circumstantial evidence what their role in all this was. And then from there what crime may apply, if any. I think this is where they will struggle to get a timely, unanimous verdict.
My guess would be:
Sharif - guilty of murder
Stepmum - guilty of allowing death
Brother - not guilty