The two adults and two children, aged nine and 14, were in their Mackay Street home when the shots were fired about 8.50pm.
Police inspected the house and located damage to the exterior of a front room, before searching nearby Chisholm Road, Auburn, where they located damage to a metal fence consistent with a shot being fired.
As Auburn police conducted further canvassing of the area, witnesses said they heard several shots nearby between 7pm and 7.30pm.
Investigations are ongoing and anyone who noticed or heard anything suspicious in the vicinity of Webbs Avenue playing fields is urged to contact Auburn Police on 9646 8699 or Crime Stoppers on 1800 333 000.
