Elon Musk was spotted with his son X Æ A-XII at a German Tesla factory as his custody battle with Grimes drags on

• Elon Musk took his son X AE A-XII to a Tesla factory in Germany as it reopened after a power cut.

• The factory had been without power for nearly a week due to a fire at a nearby pylon.

• Musk and his son were seen together amid the Tesla chief's custody battle with Grimes.

Elon Musk took his son X AE A-XII to a Tesla factory in Germany this week as his custody battle with Grimes over their children continues to play out.

The Tesla CEO was spotted carrying X AE A-XII on his shoulders as he visited the site.

The factory reopened Wednesday after a nearby electricity pylon was set on fire, leaving the plant without power for almost a week. In a letter posted on website kontrapolis.info, a militant group claimed responsibility for the fire that caused the power cut.

Tesla's X account posted a photo of Musk with the caption: "Thanks for visiting" after it resumed production.

Musk and musician Grimes have been embroiled in a dispute over their three children. The billionaire quietly sued her in September, seeking to "establish the parent-child relationship" with their children Exa and Tau, as well as X AE A-XII.

Then, later in September, Grimes filed a petition to establish a parental relationship," court records showed.

Musk brought X AE A-XII to a meeting with the Turkish president that same month, who asked him where his wife was, even though the couple had never married. "Oh, she's in San Francisco," Musk replied. "We're separated, I take care of him mostly."

In Musk's lawsuit, he accused Grimes of moving to California to "circumvent the jurisdiction" of Texas courts, which cap child-support payments at $2,760 a month for three children, BI previously reported.

Then Grimes said that she and two of their children had been living in California when Musk filed the petition, per a November filing previously obtained by Business Insider.

The trip to the German factory marks at least the second time that Musk has taken X AE A-XII on an overseas trip this year, as they also visited Auschwitz in January.

Elon Musk didn't immediately respond to a request for comment from Business Insider, made outside normal working hours.

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