"Had they been walking out the [bedroom] door it would have got them."
The family believe the second shot was fired in the direction of two people outside, who had started running after hearing the first shot.
Those pellets ended up in the fence. She said when talking to the police in the morning they realised the shell had landed near where the two had been standing.
She said everyone had was shaken up. "We're just glad no one got hurt."
The two who had been asleep first thought it was an explosion, or something had been smashed into. The two outside were "shaking, stunned, just in shock".
Two children were in the house at the time, as well as three other adults sleeping in the lounge.
Senior Sergeant Rob Huys confirmed police were investigating and had been to the house.
"Fortunately no one was injured and police are taking this very seriously.
"We appreciate this occurred in the early hours of the morning however we'd like to hear from anyone who may have seen a white four-wheel drive in the Balmoral Rd area around the time of the incident."
Police would like to hear from anyone who may have witnessed the shooting.
If you have any information that could help the investigation, contact Mr Huys, Whangarei police, on 09 430 4500, or phone anonymously via Crimestoppers on 0800 555 111.