Finneas, 25, answered to a social media consumer who criticised his sister’s courting with Rutherford, who’s 10 years elder to her.
“Your sister’s courting a 31-year-old guy and your song is s***ty,” the social media consumer wrote.
On Monday (26 December), Finneas answered to the feedback, writing: “I need my sister to be at liberty and secure.
“She is a 21-year-old grownup completely entitled to make her personal existence choices,” he added.
Eilish and Rutherford made their first red carpet debut as a couple on the LACMA Artwork + Movie Gala in Los Angeles remaining month.
When requested if she has a boyfriend, Eilish applauded herself for “pulling” Rutherford.
“I controlled to get my approach to some degree in my existence the place I now not most effective used to be recognized by means of an individual that I believed used to be the freshest f***ing f***er alive, however pulled his a**,” she mentioned, prior to asking the group to offer her a spherical of applause. “Jesse Rutherford, everybody! I pulled his a** – all me! I did that s***. I locked that motherf***ker down.”
Eilish’s courting with Rutherford has won a lot scrutiny because the two showed they have been courting, as many fanatics expressed concern over the pair’s age gap.