Sharaz Ali, 40 and Calum Sunderland, 26, are accused of murdering Bryonie Gawith, 29, Denisty Birtle, nine, Oscar Birtle, five, and 22-month-old Aubree Birtle and attempting to murder Antonia Gawith Bryonie Gawith, 29, Denisty Birtle, nine, Oscar Birtle, five, and 22-month-old Aubree Birtle were all killed (Image: Ashley Pemberton / SWNS)

A woman broke down in tears as she described how she "couldn't save" her sister and three children from a "catastrophic" house blaze allegedly started by her ex-partner.

Prosecutors claim Sharaz Ali was "motivated by jealousy and fuelled by drink and drugs" when he torched the home of Bryonie Gawith and her three young children in the early hours of August 21 last year, resulting in all four deaths.

Ali stands accused of targeting the property

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