A mother and daughter needed hospital treatment for head wounds after being attacked during a break-in at their home in West Sussex.
The women had stitches to wounds inflicted when they were hit on the head with a weapon after they confronted the two intruders.
The attackers broke into the house in Cricketers Close, Ashington, at 21:10 BST on Thursday.
A male victim also in the house was hit in the stomach.
"Both women received deep wounds to their heads and were treated in hospital where one remains," said Det Con Katy Lewis.
"This was a scary experience for the whole family."
Sussex Police said the men broke through the front door of the house and shouted "police".
They ran upstairs, where they were confronted by the mother and daughter. The attackers fled in a dark coloured car after the male victim called police.
Both intruders were about 5ft 8in, white and of a stocky build. They were wearing dark clothing and balaclavas.
"We are hoping someone might have seen the car the suspects used in the area and can give us some information," said Det Con Lewis.