A man who lost his wife and daughter in a crash on the A1 in Newcastle said his life had been "destroyed".
Joanne Richardson, 40, from Teesside, died in the crash on Sunday. Six-year-old Mya died in hospital the next day.
Ian Richardson, 37, paid tribute to his "wonderful girls" and said his surviving daughter, 12-week-old Ava, would give him the focus to carry on.
A man who was arrested on suspicion of causing death by dangerous driving was released on bail until October.
Mr Richardson, from Billingham, said he had made the difficult decision to donate Mya's organs.
He described her as a "great kid" who was "full of life and spirit".
He said: "Even though Mya's light was taken from us, we wanted her to live on.
"Mya's selflessness means that at least six other families will have the chance of a future.
"That little bit of knowledge gives us some consolation."
The family had been travelling back from a weekend in Dundee for the wedding of Mr Richardson's brother Simon, where Mya had been chief bridesmaid.
Mr Richardson and Ava suffered minor injuries.
Mr Richardson said his wife had been a devoted mother who had always put their girls first and supported him.
He said: "My life has been destroyed and my girls have been taken from me before their time.
"The only light I have now is my baby Ava. She gives me the focus to carry on and begin again."