Per this NY Post article the NY Times is reporting that SIL was last to see NG. BBM:
"Annie Guthrie and Tommaso Cioni kept a low profile during their drive on Tuesday, in pictures obtained by Page Six.
Savannah’s sibling attempted to cover her face with a pink hoodie while leaving the couple’s Tucson, Ariz., residence.
Annie’s husband similarly pulled his sweatshirt up over his nose and sported a pair of sunglasses.
The duo’s outing marked the first time Nancy’s family members have been spotted since she became the subject of a missing persons investigation.
Cioni was the last person to see Nancy — despite previous reports it was Annie — as he was the one to drop his mother-in-law off at her house around 9:30 p.m. Saturday after dinner, according to the New York Times."
Annie and Tommaso Cioni attempted to cover their faces during a Tuesday drive, two days after the 84-year-old matriarch was reported missing.
pagesix.com