• Grimes tried to serve her former partner Elon Musk with custody papers last month.
• Process servers attempted to deliver the papers at X and Tesla, and one even tracked Musk’s jet.
• Grimes is suing Musk for physical custody of their three children.

Grimes hired people to search high and low for her kids’ father, Elon Musk, to serve him with custody papers, according to court records obtained by Insider.

The singer, whose legal name is Claire Boucher, is suing Musk for physical custody of their three children. Grimes told a Texas court in October that Musk had custody of her three-year-old son, X Æ A-Xii, “over [her] objection.” Her lawsuit came just a few weeks after Musk quietly sued her to “establish the parent-child relationship” with his children.

A lawyer for Grimes filed a supplemental proof-of-service document last Friday, showing they had attempted to serve Musk with custody papers on multiple occasions and had delivered the documents via substituted service, meaning the papers were given to workers at some of Musk’s businesses, as well as staff at a property associated with the billionaire, instead of Musk himself.

As of Thursday, Musk had not formally responded to the lawsuit.

Grimes hired four process servers to deliver the papers. From October 13 to October 20, they tried to track the billionaire down across at least a dozen locations, including X’s headquarters in San Francisco, SpaceX’s launch site in Boca Chica, Texas, Tesla’s Austin gigafactory, and several addresses associated with Musk near Austin.

One of the process servers even went to a horse farm that had been tied to the billionaire. “Nope, not here,” a woman on the site told them when they asked for Musk.

One process server even tracked Musk’s private jets to confirm the best place to contact the billionaire, Grimes’ court papers said.

Two process servers also attempted to serve Musk at Shivon Zilis‘ house. Zilis is a director at Neuralink,