Aaron gives his Backstreet Boy brother a warmer response on Twitter this time around.
"Happy birthday to my baby brother and sister Angel Carter and Aaron Carter," Nick wrote.
"You're an awesome person bro! I'm always in your corner," Aaron responded.
The short, but sweet interaction was a complete 180 from the last time their relationship was in the spotlight, shortly after Aaron was arrested for a DUI and possession of marijuana in Georgia.
"To my brother: I love you no matter what and if you feel the need to reach for help, I am here and willing to help you get better. Family isn't always easy. We're all here for you," Nick tweeted in July after the arrest.
Aaron responded to his brother's attempt to help on Twitter writing, "If my own blood truly cared about my well-being, why wouldn't he call me directly and have a conversation instead of making this about him through a very public forum?"
2017 has been a year of trial and triumph for the brothers. Aaron was in and out of a treatment facility to take care of some of his personal and health issues.
The "Don't Say Goodbye" singer also appeared on a troubling 2-part special of "The Doctors," in which he came clean about his emaciated appearance, drug use, social media backlash and fears of getting sick with cancer or HIV.
TooFab spoke exclusively to "The Doctors" host Travis Stork who conducted the extensive interviews and evaluated Carter's mental and physical health.
"The warning signs are apparent," Stork told TooFab. "Aaron is very emotional. He’s up and down, he's happy and sad. I think for him getting to the root cause of that, which some of it is his dependence on medicines like Xanax, KPins and such for severe anxiety, and he’s also been prescribed Oxycodone which is an opiate, which is a highly addictive medicine and for Aaron whenever he’s feeling over stressed, I think his coping mechanism is dependent on the medicines he’s on and that happens to a lot of people so I don’t fault him for it. But it is a dead end road and when you look at Aaron it doesn’t take being a doctor to realize his physical health, not just emotional health is in jeopardy right now."
Meanwhile, Nick has denied allegations that he sexually assaulted former singer Melissa Schuman in 2002, when she was a member of the girl group Dream. Schuman, who was 18 at the time of the alleged incident, claimed the Backstreet Boy raped her in a detailed blog post she published last month. Carter would have been 22 at the time.
"I am shocked and saddened by Ms. Schuman’s accusations," Carter said in a statement to People. "Melissa never expressed to me while we were together or at any time since that anything we did was not consensual."
Schuman alleged that Carter ignored her protests that she was a virgin and that she wanted him to stop. "He was relentless, refusing to take my no’s for an answer," she wrote.
"This is the first that I am hearing about these accusations, nearly two decades later," Carter wrote. "It is contrary to my nature and everything I hold dear to intentionally cause someone discomfort or harm."