Ivanka Trump and husband Jared Kushner welcomed their second child, a boy, on Monday evening in New York.
The little guy, born at 9:54 p.m., got a big name: Joseph Frederick Kushner, the two-time mom announced Tuesday on her Tumblr page. The name comes from Mom and Dad's paternal grandfathers, she said.
"Both men set the standards that have been passed down through the generations and which we hope to impart upon Joseph and Arabella," wrote Ivanka, 31. "They created a legacy for our family that inspires our careers as well as our love and respect for one another. We are honored to name our son after these two distinguished men."
Mom posted an adorable photo of her daughter with the girl's new baby brother, captioning it "Arabella is such a proud big sister."
Joseph's maternal grandfather was proud as well.
"My beautiful daughter Ivanka just had a healthy baby boy. Jared and Ivanka are very proud!," six-time grandpa Donald Trump tweeted Monday night before thanking well-wishers for their kind thoughts, which he deemed "so nice."
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