Jake Morris, 14, and nine-year-old Noah were in their Ford S Max with their parents Matt Morris and Louise Highfield on Lichfield Road, Wolverhampton, on April 14 when they were involved in a crash with another car.
The brothers were taken to Birmingham Children's Hospital where Noah had an operation on his fractured skull and Jake had a broken femur operated on.
Noah was discharged after two days but Jake still remains in hospital with what the doctors have called "one of the worst breaks they have seen," Matt said.
Their father Matt, who works in carpet fitting, has spoken out about the crash.
He said: "It was on the 14th and we were coming home and we were within two minutes of our house.
"The air bags went off, I can picture it now it was horrendous.
"We got out of the car. My eldest son got out as he could hear his brother crying and didn't realise what he'd done to his leg and he collapsed on the floor.
"My partner got to Noah. The police came quite quickly. I went with Jake and Louise went with Noah to Birmingham Children's Hospital.
"My partner has bruises all over her chest, her stomach, her legs and is in pain. My back is really hurting and my neck and across my chest.
"The boys both had to have scans.
"Noah had to have a scan on his head, luckily there was no damage done although there was a deep laceration and a slight fracture to his skull and he went down for surgery the next day, he's got a really good cut from the front to the back of his head.
"Noah came home but Jake is still in hospital, he had to have lots of scans on his legs and knees.
"He's broken his femur so he had to have surgery on Friday, he was down there for six hours, he had to have a plate in his leg.
"We take it in turns to see him. He is up and down, he's getting flashbacks.
"It has been terrible. When you see your children lying in two hospital beds it's heart breaking."
Louise's sister Emma Jones launched a fundraising page for the family which has tripled its target and already raised £600.
Matt, 38, added: "It's for the kids to treat them, Emma's done it to take them on trips.
"Jake's got a long road to recovery."
The female driver of a Renault Clio was arrested after providing a positive breath test after the crash and has since been released while the enquiries continue, West Midlands Police said.