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.