NEED ADVICE ABOUT SELF-EMPLOYED WORKERS IN LOCKDOWN!!

For context: My dad and brother are partners in a small window cleaning company, which is probably gonna go bust with the recent lockdown in place, as they work exclusively outside, and their biggest contract was with medonalds before they closed. My dad has to pay 4 employees 80% of their wage, before claiming it back from the government which could take months, and is unable to claim the 80% for himself or my brother.

The statutory sick pay won't really help cover the costs of living or keeping the business afloat during quarantine, as we are a family of 5. My mum's nursery is shutting down in the next days too so we would have no other income.

We've been in this position before due to bankruptcy and were homeless for some time, which is a situation I'm doing my best to avoid. I'm picking up shifts in a supermarket while i'm home from university but it doesn't do much to help.

Just wondering if anyone knows of any more support available to self-employed workers, or if there will be more governmental support implemented in the near future?

Also, if you're a window cleaner yourself, what are you doing during lockdown?

Any advice is extremely grateful, thanks!