Dani’s brother, Miguel, initially joins Dani and Grace in evading the Rev-9, though I suspect like their dad, he also won’t survive the events of Terminator: Dark Fate.
The only reason Dani makes it out alive is due to the timely intervention of Mackenzie Davis’ Grace, a cybernetically-enhanced soldier-assassin from the future who is filling the same protector role that Kyle Reese and the benevolent T-800 did in The Terminator and Terminator 2: Judgement Day, respectively.
Terminator: Dark Fate (2019) – La Misión de Dani Extended Look - Paramount Pictures