X's mother is the singer Grimes. X was born in 2020, and is Elon's youngest. He's the one he shows off in public simply because of that. The next youngest at triplets in their late teens. He also has another two sets of twins.
One of the 12, kids, the first, died of SIDS.
I'd guess the multiple births had something to do with the in vitro fertilization.
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