Grimes' mom has claimed that Elon Musk has 'withheld' passports belonging to the three children he shares with the singer, shortly before they were due to take a trip.
Musk, 53 and Grimes, 36, have long been embroiled in a custody battle over their three children, the status of which is currently unknown.
The pair first started dating back in May 2018 and welcomed their first child together, son X Æ A-12 in May 2020.
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They then went on to have two more children, via surrogate - a baby girl called Exa Dark Siderael and later, a boy named Techno Mechanicus.
The pair have since split, but fast-forward to this week and Grimes' mother has publicly criticised Musk for allegedly withholding the kids from their mom.
Apparently, the family were supposed to take a trip to Canada, but Musk is accused of 'withholding' their passports.
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Sandy Garossino tweeted Musk on X, explaining that her mother - the kids' great-grandmother - 'yearns to see and hold' the children 'one last time', claiming that she hasn't even met one of them yet.
Apparently, the children were set to visit her in Canada but the trip had allegedly been canceled.
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"She was thrilled for the kids' planned visit to celebrate her birthday this weekend. Today. But those hopes were crushed when the trip was canceled," said Garossino.
"I am alarmed to learn that the children cannot come as you are withholding them and their needed passport documents from Claire," she added, referring to Grimes' given name.
"Where are the other children, and with whom? They are scheduled to be with their mother. They were expected here in Canada."
Garossino pleaded with Musk to return the kids, adding: "I write with a grandmother’s plea, asking you to honour your agreement, return the children, and provide the documents they need to see their great grandmother before she passes.
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"Please Elon, I beg you. This is so painful for my mother, and concerning for the kids. Time is of the essence now."
UNILAD has reached out to reps for Grimes and Musk for comment.
Amid the messages on X, Musk's daughter, Vivian Jenna Wilson accused her dad of 'illegally keeping' the kids from their mom.
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"As you may or may not know, Grimes is currently in a custody battle with Elon over their 3 children," she said.
"What you probably don’t know, however, is that Elon has been illegally and continuously keeping their children, her children, away from their mother during the most important developmental period in a child’s life.
"While Elon has been irresponsibly partying across the ocean in the very country he’s spitting contemptuous poison about, Grimes’ children are stuck in a house thousands of miles away without their mother.
"This is potentially irreversibly damaging to a child’s psyche and is, without question, a despicable form of abuse. This is not the first time this has happened and if nothing changes, likely not the last."