BREAKING NEWS: Two young brothers tragically drown in backyard swimming pool - after their sister died at just 16-weeks old

Two young brothers, pulled unconscious from a backyard pool in Brisbane last week, have tragically died in hospital.

The news of their death comes after their baby sister died at just 16 weeks old. 

Both Michael Porter, two, and Josh Porter, one, were pulled from a pool in Morayfield, QLD in north Brisbane last Monday.

They were in a critical condition in the Queensland Children's Hospital paediatric intensive care unit, but their parents, Carmen and Jo, announced they had passed away in a statement. 

The boys' parents said they were thankful for the support of hospital staff during the ordeal.

"It is with great sadness that we advise that our boys are no longer with us," the statement said.

"Our family is incredibly grateful for the support and care provided by staff of the Queensland Children's Hospital.

"We ask the media to please respect our family's privacy at this sad time."

Neighbour Garry Bryan described the brothers as 'beautiful little boys'.

He told The Courier-Mail that Michael was 'full of energy' and 'was always out wanting to help dad mow the lawn.'

Devastated friends had set up a GoFund me page for the boys to raise money for their care.

It read: 'Carmen and Jo are beautiful parents and need all of our love and support at this horrible time. Michael and Josh are in all of our thoughts and prayers.' 

The oldest toddler Michael died on March 28 and his life support was turned off at 11am the next day. it's thought little Josh died at the weekend.