Liam has been dating Miley on and off for almost three years.
They're like 21 or something ... I can't see that happening. You have to ask him about his relationship," said Chris.
And it seems 22-year-old Liam, agrees with his elder brother as he recently said he was too young to wed 19-year-old Miley.
"Marriage and kids are way in the future for me. I'm young. It's not really on my mind at the moment - marriage, kids or anything," contactmusic.com quoted him as saying.
Miley sparked rumours engagement rumours after she was spotted wearing a diamond ring on her ring finger.
The singer-and-actor posted a picture of her manicure on Twitter, revealing a big rock parked on her left hand in the process. However, her representative denied that it was an engagement ring.