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
The Judge said "no sentence I can pass will ever feel like enough for this family."
The pool in Birmingham has been temporarily closed after a bug which can cause diarrhoea, vomiting and low-grade fever entered the water.
The three men were arrested by West Midlands Police counter terrorism officers and are due before Westminster Magistrates' Court in London.