The mother of twins who fell mysteriously ill earlier this week is facing felony drug charges.According to the Forsyth County Sheriff's Office, Laurel Corrine Gray, 29, of 5959 John Burruss Road and her live-in boyfriend, Michael Robert Conley, were arrested Tuesday night. Gray and Conley, 27, have each been charged with one count each of possession of more than one ounce of marijuana and intent to distribute.Authorities say the drug charges are not related to the children's situation.In addition, Gray has been charged with a misdemeanor count of obstruction of an investigation.Both suspects are being held at the Forsyth County Detention Center. Gray's bond has been set at $28,655, while Conley's is $28,980, a jail spokeswoman said.Sheriff's deputies served a search warrant on the couple's north Forsyth home Monday, after both of Gray's 4-year-old boys were taken to Children's Hospital of Atlanta at Egleston.