Fire destroyed my home – Insurance denied my claim

In May my home in South Australia where my son and partner live caught fire from a drill battery melting and caught charger on fire and burnt my house down to beyond repair and nearly $100,000 in contents burned or ruined.
8 months ago I was led to believe my claim was granted only to find out by accident it was on hold and we three were under investigation. This has been the most invasive, harrowing, completely stressful time we have endured.
Now after complying to all their demands andI mean demands today 18th December I got told it was denied for non disclosure as I had a claim with in the last 5 years which they knew about but because my family member has a criminal record and I didn’t tell them when he moved in I have no cover at all.
so I’ve lost nearly everything $300,000 because of a clause that I failed to tell them of a change in my policy. I signed the agreement and was expected to know 100% of that policy before I signed it.
Problem is as they made promises to pay back the thousands I paid out for emergency accomodation and now the squaller they both live in is denied also.
I need bit of help to organise to get some water restored, power too so they can live in one remaining room as I also bought a caravan for them to live in and the council have put a stop to that straight away.
Ive exhausted my funds and just want to help them live, shower in warm water, get a washing machine to clean clothes, feed their pets.
i intend to fight with what energy I have left, my life went up in smoke and it’s almost all. gone.
I’m not sure if this is what I’m meant to write but my first time and I’m desperate.
Thank you for reading this
Nicole