A man who killed his former partner’s sister and her three children by setting fire to their house in a botched revenge attack has been found guilty of murder.

Sharaz Ali was “motivated by jealousy and fuelled by drink and drugs” when he started the “catastrophic” blaze at the home of Bryonie Gawith and her three young children in the early hours of August 21 last year.

A court heard Ali, 40, went to “take revenge” on his former partner, Bryonie’s sister Antonia Gawith, who was staying there after ending their abusive seven-year relationship.

While Antonia managed to escape the fire, Bryonie, 29, and her three children, Denisty Birtle, nine, Oscar Birtle, five, and Aubree Birtle, 22 months, were trapped upstairs and could not be saved.

On Wednesday, Ali was found guilty of murdering Br

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