Beth waited until her parents returned from work before saying anything to anyone. In truth, she was afraid it might be a hoax, or criminal, or might have unacceptable strings attached. Her spirits oscillated between huge elation and deep depression all day. When Reuben woke, she hugged him close to her for an age, for fear he might somehow be at risk. She contacted nobody.
Since they would be involved, she had to tell her parents. That was her chance for release. More tears, more hugs all round.
Then they tried to work out where the money was coming from.