Grimes took to Twitter in a series of now-deleted posts, urging Elon Musk to “respond” to an urgent medical situation involving one of their children.

The singer, whose real name is Claire Elise Boucher, and Musk share three children—X Æ A-Xii, Exa Dark Sideræl, and Techno Mechanicus—from their relationship, which lasted from around 2018 to 2022.

Since their split, Grimes has gradually distanced herself from the Tesla CEO. She recently spoke out against Musk bringing their four-year-old son, X Æ A-Xii—known as Little X—to the White House and allowing him to appear on live television.

Little X was seen in the background at the Oval Office as Musk, serving as head of the U.S. President’s Department of Government Efficiency (DOGE), attended the signing of an executive order.

Grimes only learned about her son’s televised appearance after a Twitter user complimented the child’s behavior. Responding to the post, she wrote, “He should not be in public like this. I did not see this, thank u for alerting me. But I’m glad he was polite. Sigh.”

This wasn’t the first time Musk had brought Little X into the public eye. He had previously taken him on stage at a rally and included him in an interview with right-wing commentator Tucker Carlson.

The latest disagreement between the former couple surfaced on February 20, when Grimes posted a series of urgent messages on Twitter, pleading for Musk’s attention regarding their child’s health.

“Plz respond about our child’s medical crisis. I’m sorry to do this publicly but it is no longer acceptable to ignore this situation. This requires immediate attention,” she wrote.

She continued, “If you don’t want to talk to me can you please designate or hire someone who can so that we can move forward on solving this. This is urgent, Elon.”

When a Twitter user suggested that making the situation public might not be the best approach, Grimes reportedly replied, as cited by PEOPLE, “I’m not giving any details but he won’t respond to texts call or emails and has skipped every meeting and our child will suffer life long impairment if he doesn’t respond asap.

“So I need him to f**king respond and if I have to apply public pressure then I guess that’s where we’re at.”

Grimes did not specify which of their children is facing the medical crisis, and since the tweets have been deleted, it remains unclear whether the situation has been resolved.