Donald Trump Jr. is firing back at Chelsea Handler for a spelling mistake in her tweet mocking his brother expecting his first child.

The Netflix talk show host posted her reaction to Monday’s announcement that Eric Trump is expecting a son with his wife, Lara.

Handler, who had pledged to move out of the United States if Donald Trump became president, wrote:

I guess one of @realDonaldTrump's sons is expecting a new baby. Just what we need. Another person with those jeans. Let's hope for a girl.

— Chelsea Handler (@chelseahandler) March 20, 2017

The older of President Trump’s two adult sons responded to the slam, noting that Handler wrote the apparel form of jeans, rather than “genes.”

Jeans??? I guess I'm not at all surprised… but really?!?! #genes https://t.co/fIUJwEtl8U

— Donald Trump Jr. (@DonaldJTrumpJr) March 20, 2017

Trump’s ninth grandchild is reportedly due in September.