PIL's sold their house last year with the intention to travel the world. They moved around a little but have since realised that they don't have a fraction of the money that travelling requires and are now homeless and in a word, skint. They've moved in with us (that's a whole thread in itself) however are not contributing to any bills. What do I need to update to reflect they live here from a legal point of view? MIL keeps rambling about being added to 'poll tax' but online it says she only needs to appear on there if she's a joint owner or partner. Can anyone give me a starting point please before I go and travel the world to avoid them!