It is sad to read your story. Unfortunately your experience is not all that uncommon in the RV industry, especially with entry level motor homes. Many RVs brand new have such issues.
Given your particular situation with no other place to live, I would get up on the roof and try to find the source of the leak and fix it myself, preferably permanently, but even if only temporarily to prevent further water damage. Unfortunately, you will find that the best person to get your rig right, is you the owner.
A very common place for water to leak inside is at those orange and red high-mounted lights. It is a shame that those lights are installed in the first place but the government requires them on vehicles 80" or wider. A very thin amount of clear silicone caulk, around the entire base of the light, will be adequate to seal it. Be careful not to caulk the lens to the base because you will need to replace the light bulbs one day.
But before you start caulking, first unscrew the light and inspect for a gasket. It might have been accidentally deformed (not placed properly) from a fast-operating assembly line worker.