"Jacob doesn't know. It is sad but there is nothing we can do about that," Anna's brother Mark Pidduck said.
"We are going to video the funeral and try to see how he goes. We will get him counselling."
Jacob's father, Ian Henderson, had not left his son's side since the accident but attended his former partner's funeral yesterday.
Jacob suffered a head injury, cracked ribs and a cut to his arm in the crash and had been put in an induced coma until his brain stopped swelling.
"The doctors have told us not to even ask what will happen for at least another three days," Mark Pidduck said.
"We just have to wait. They have to wait for things to settle down, for the swelling to go down."
Jacob's friends had visited the family home to pay their respects but Pidduck said the biggest hurdle would be next week when his friends returned to class without him.
"That will be hard and there will be a lot of questions," Pidduck said.
Anna's older brother Mike said Anna was killed at an intersection she crossed every day on her way to work in customer service at the florist Lilies by Blewden.
He said Anna had stopped to let a truck and trailer past and pulled out without seeing there was a truck trailing behind.
Anna Pidduck's parents Terry and Bev Pidduck were devastated at the loss of their youngest child and only daughter, who had lived in Cambridge all her life.
