Juan Carlos da Silva, 35, and his son Pablo, 10, were pronounced dead by medics at the scene in Gunnersbury Avenue, Acton.
The crash happened at about 1.50am, soon after a party they had been holding for friends and family at the W3 Cafe in Churchfield Road, Acton, which Mr da Silva ran with his partner, who has been named elsewhere as Lucy Andrade.
Traders in the road said they did not know the family well but those that met him said Mr da Silva was a decent man.
Neighbours described Pablo, pictured, as a 'polite little boy'.
Jilan Mohamed, who works at the Al-Rafidan Supermarket a couple of doors down, said: “He was a brilliant guy. He was never any trouble. He used to come in for change and his son used to buy sweets. They were both always polite and friendly.
“The whole family were very nice. It’s very sad. An act of God.”
Police are investigating the crash and are appealing for witnesses. They do not believe any other vehicles were involved.
Anyone with information should call the Met's Road Death Investigation Unit on 020 8998 5319.
If you know the Da Silva family and wish to pay tribute, please call the newsdesk on 01895 451036, or email email@example.com