The woman was in her mid-40s. The age of her parents is not yet known. An investigation into what caused the deaths is under way, but the incident is not being treated as suspicious.
Shortly before 1pm this afternoon, we were called to a caravan park near Camborne in Cornwall, where a helper had been unable to get a reply from an elderly couple who lived in the caravan.
We were able to see that there was a figure sat in a chair but they were unresponsive to knocks at the door.
Cornwall Fire and Rescue were called. They forced entry into the property and found that the three occupants were all dead.
More top news
Commuters were also warned to expect travel chaos as Doris gathered speeds of nearly 90mph.
A man with 62 penalty points on his licence is among thousands of motorists allowed to drive despite exceeding the limit warranting a ban.
Storm Doris is set to bring severe weather across much of the UK on Thursday as heavy rain and strong winds push in from the west.