On a quiet, tree-lined street lined with multimillion-dollar properties, one home stands out: a 14,400-square-foot mansion that Elon Musk, 53, plans to turn into an unusual family compound.

In recent months, Musk has envisioned his children (at least 11 of them) and two of their three mothers living in adjacent properties. The kids would be able to be a part of each other’s lives, while Musk would have more freedom to spend time with them.

Just behind the mansion is another six-bedroom mansion. The combined value of the two properties is around $35 million. When in Austin, Musk often stays at a third mansion about a 10-minute walk away.

That’s three mansions, three mothers, 11 kids, and one mysterious billionaire dad. The fear of falling birth rates is even driving Musk to expand his already unusual family.

“I’m doing my best to confront the population crisis. Falling birth rates are the biggest threat civilization has ever faced. Mark my words, this is the sad truth. I hope you have big families, and I congratulate those of you who have big families,” Musk proudly said.