Karima Mahmoud, 43, and Adam Glanville, 7, were first reported missing in Richmond on June 3.
After months of being unable to find the pair, yesterday (October 24), police received a new sighting of Karima.
She was spotted near Bedfont Road in Feltham in west London.
Karima is said to be in breach of a family court order and police are trying to locate both her and Adam.
The Metropolitan Police said it’s possible that Karima may have altered her appearance.
Detective Sergeant Mary Dawson, who is leading the investigation, said: “Have you seen Karima or Adam in recent days? Are you renting a room or accommodation to them?
“While our enquiries remain ongoing, we need your help to locate Karima and Adam.”
Anyone who has seen the two or who has information that could help locate them is asked to call 101 quoting 01/421708/24.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.