Russian Space Freighter Lost

"Until the cause of Wednesday's failure is firmly established, it is unlikely the next astronaut flight to the ISS, due on 22 September, will be allowed to proceed.

In that case, the crew already on the station and preparing to come home would be asked to stay up longer."

What if they say "no"?

I hope that's coffee and not chewing tobacco.

Do they issue parachutes?

You wrote, "What if they say "no"?"

There is always the Soyuz TMA emergency evacuation vehicle, but I would imagine whoever decides to bail using that will be in big trouble when they return.