The 17-year-old male arrested after two girls were stabbed is believed to be their brother.
One of the victims is thought to be aged 16 and police now believe the other victim is 10-years-old.
A woman in her 40's was also stabbed. The condition of the three is said to be 'serious'.
A baby discovered at the house was unharmed.
More top news
A cloudy start, but turning fine and warm later.
Rather cloudy with a little light rain possible at times.
A former doctor at Birmingham Children's Hospital has admitted molesting cancer patients as young as eight-years-old.