The twins that Tesla Inc TSLA chairman Elon Musk fathered with neurolink executive Schivon Zilis were conceived by in vitro fertilization (IVF). Reuters.

Neuralink is Musk’s brain chip company. According to the report, Zilis, 36, told her colleagues that she was not romantically involved with Musk and that they were not in a relationship.

According to five sources close to the situation, she shared with some of her colleagues that she fathered the children with the Tesla CEO through IVF. However, Reuters could not verify the accuracy of Zilis’ account.

Zills, who has worked at Neuralink for five years, gave birth to the twins last November. The children were born shortly before Musk and his former partner and musician. Claire Elise Boucherbetter known as dirtShe had a child in December.

Last April, Zilis and Musk requested a Texas court to allow children “to have their father’s last name and their mother’s last name as part of their middle name.”

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Zilis worked as Musk’s Director of Operations and Special Projects at the neurotechnology company.

Neuralink’s corporate policy prohibits relationships between supervisors and subordinates to avoid conflicts of interest.

However, Reuters reported that the company accepted Zilis’ explanation that her relationship with Musk was not romantic. She was thus allowed to continue her role.

Both Musk and Zills have continued to work together since announcing their children. However, corporate governance experts polled by Reuters were divided on whether Musk violated ethical boundaries by having children with Zilis.

In a recent event, Musk sent Zilis to set up a meeting with him Thomas Oxleythe CEO of Neuralink’s competitor Synchron.

Musk fathered 10 children (one of whom died in infancy) with three different women. Musk has increased his