"Police quickly went to the address and canvassed the area, however they did not locate the man or the vehicle," a police statement says.
"If you see this vehicle, or believe you know who committed this crime, please call 111 immediately.
"The victims are understandably shaken but thankfully otherwise uninjured."
They are receiving support from police, victim support and other family members.
Police say they have "a number of enquiries underway" and asks that anyone who suspects that they might know "who this man is to do the right thing and come forward".
Information can be reported to Christchurch Central Police Station, or anonymously via Crimestoppers on 0800 555 111.