The difficulty I am having is that you are asking questions without reading the response I am giving you. Perhaps it is because it is not the answers you are looking for. And so, you ask the same question in several different ways. I believe I have answered you extensively.
1. The child is residing their as an owner. You are living in a shared accommodation with the landlord. It makes you a lodger.
2. A lodger can be given notice to leave the premises. The notice period is determined by either the contract or if the contract is silent, the time within which you would normally pay rent.
3. If you leave before your contracted period ends then you can be required to pay rent for the contract period. If however you are properly given notice to leave then you are not liable to pay any further rent when you leave the property.
4. I am not sure what a levy is. you will have to check your contract to see or ask the landlord what they are referring to.
5. You can be charged for any damages done to property.
6. No a landlord cannot simply keep your deposit.
7. I would imagine I have some expertise, I have been practicing as a lawyer for 9 years in this area.