Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

There was a minor accident with a doctor’s son but the doctor noticed no major injury. After the treatment, the father of that doctor’s son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?