I've raised £2000 to help my mum and step dad finish their building works after they were ripped off by a cowboy builder

In october 2016 my mum and stepdad employed david haskins from custom build and maintenance to build them an extension. The work should have been completed in 3 months and they paid over £60,000 for the work.
the builder started the works and slowly stopped turning up. The works are still not completed and the builder had told them he is no longer trading after rippng them and msy other families off. They have completed a lot of the work themself and it has cost thousands of pounds more and they have used all of their savings and borrowed everything they can.
they have been living in a dusty, dangeous building site for a year and a half and have had their dreams ruined. My autistic brother suffers with asthma and exzema had to leave and stay woth me and my sister for months during one winter as the external walls had been knocked down and covered with plastic sheets, the only heating they had was a log burner and the house was freezing.
my mum had back surgery at the start of the build and had to spend the recovery in the dirty building site in the freezing cold. She is classed as disabled and has a blue badge as she is often in pain.
they want to foster children and have started the application process but cannot start this until the house is safe and suitable.
the experience so far has put strain on their relationship and caused anxiety and depression for all of them. I myself feel helpless as to what i can do to help them and so i am setting up this crowd funding to see if we can raise something towards finishing the house so that they can get on with their lives, foster the children that they hope to help and put an end to their suffering. Any donations big or small are massively appreciated. Thank you x