The model passed away on Sunday, aged 27, from an apparent overdose and cardiac arrest, and Crawford, his mother, is still "completely in shock".
A source told People: "Cindy is completely in shock over Presley's devastating death. She is heartbroken."
Police records indicate a call for an overdose in the Santa Monica-area on Sunday morning. The dispatch call also noted cardiac arrest.
Another insider close to Kaia Gerber, Gerber's sister, has revealed that the family are "in total shock".
The source shared: "They are saddened beyond words.
"Kaia loved that Presley was so open about his struggles; his family was so proud that he was finding strength in helping others."
Before his death, Gerber was candid about his struggles with mental health and substance abuse, explaining that he didn't want other people to repeat his own "mistakes".
During an appearance on the Studio 22 podcast, Gerber shared: "Having struggled with mental health, depression and some other things that come along with that, I think that whether I help one person or a hundred people get out of that place that I was in at one point in my life, that's all I need to do."
Gerber suggested that helping other people with similar issues had become his life goal.
The model said: "(Mental health) is an issue. It is such a big part of my life. It's a 24/7 job, and there's so much to it. That's really what I want to do: help people, whether you're depressed, you're struggling with something that is having a negative effect on your body. I mean it could be anything, and there's no judgement.
"I've seen a lot of stuff and I've learned a lot of things. What I hope I can do is have made the mistakes for some other people, so they don't have to make the same mistakes that I made."
In September, Kaia Gerber also reflected on her brother's addiction struggles, and explained how it had shaped her own character, too.
The 25-year-old model told Vogue: "When something like that happens in a family, it kind of levels everyone.
"I think that's also why I started to self-​identify as the easy one and never wanted to ask for help. Because it felt like too much to have two children who were needing."
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