However, a judge denied the "Warcraft" actress' request to limit the "Blurred Lines" singer's joint custody of their son, Julian.
In the legal filing, Patton claims she is "concerned that Respondent [Thicke] is engaging in alcohol and drug use while Julian is in his custody. I am aware that Respondent has a history of drug use, which existed during our marriage."
Also Read:Alan Thicke Cause of Death Revealed
She also alleges that during the summer of 2014 when they separated, Thicke "looked ill. He was pale, clammy, and shaky. It was very uncharacteristic and I was worried about him."
Patton also claims after Julian showed her how Thicke spanked him, she responded with an "ow," and added that "Julian said it was worse than that."
"I then told Julian 28 that I could not keep this secret anymore, and that I have to protect him," Patton said, according to the documents.
"Principal Smith and Ms. Mahajan called Department of Child and Family Services on January 4,2017 to report their concerns about Respondent's abuse of Julian. DCFS came to my home on January 9, 2017 and interviewed Julian and me," the motion continued. "They asked to interview Julian again, and they did in fact interview him again on Jan. 11 , 2017. My understanding is that the DCFS investigation is still pending."
PHOTOS: Robin Thick and Paula Patton in happier times
Robin Thicke accused of 'excessively spanking' son by ex-wife Paula Patton
The filing states that the current physical custody agreement gives Thicke overnights with his son every Thursday, Friday and Saturday.
After meeting when Patton was 16 and Thicke was 14 in 1991, the couple was married in June 2005. They announced their separation on Feb. 24, 2014 after 21 years together amidst a high profile and tumultuous split.
Thicke is currently coping with the sudden death of his father, Alan Thicke, who died suddenly on Dec. 13, 2016, at age 69.
Patton paid tribute to her former father-in-law in a touching Instagram post after his death, writing: "I knew Alan since I was 15 years old and he had a tremendous effect on my life. I loved and respected him so much!
"So many great memories and laughs together. We will miss him so much! His grandson is quite sure he is still here with us in spirit."
Pamela Chelin contributed to this report.
Read original story Robin Thicke Accused of 'Excessively Spanking' Son by Ex-Wife Paula Patton At TheWrap