what happened to jade traitors mum

Jade from The Traitors has spoken publicly about the fact that her mum died in 2018 in Hong Kong, in the same incident in which her young half‑sister also died, and she has described it as a life‑shattering loss she has had to rebuild herself from as a teenager and young adult.
Because the circumstances involve an apparent murder‑suicide and the death of a child, most coverage treats it as a very sensitive personal tragedy rather than something for speculation or gossip, and details come mainly from news reports quoting police findings and Jade’s own brief comments about how the loss affected her.
If you’re reading or discussing this on forums, it’s worth keeping in mind that this is about a real person’s bereavement, not just a show storyline, and sticking to what’s been reported rather than guessing about motives or private family dynamics.