Donald Trump has five children, two sons-in-law, one daughter-in-law, and one ex-daughter-in-law. Most of them are selling various products, from cryptocurrency to activewear , when they aren’t dabbling in policymaking and shady yacht deals . So I understand that it’s tempting to draw the line at knowing things about Lara Trump and Vanessa Trump . But between receiving a controversial exemption to compete in the LPGA Tour this week and peddling $130 sweatshirts on the White House lawn, Kai Trump is becoming hard to ignore.

Here’s a guide, which we’ll keep updated, to what you need to know about the 18-year-old First Granddaughter, golfer, and social-media personality to maintain your Trump-family fluency.

. How old is Kai Trump?

Kai Madison Trump turned 18 on May 12, 2025.

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