I think it depends on how long you and thomas have been living under the same roof. Here in australia if you have been living together for longer than 12 months i think you are regarded as a defacto couple so we are pretty much married by law just dont have the piece of paper saying that we are husband and wife!
Age might have alot to do with it as well *shrugs*!Here your still classified as a child till your 18 years so any type of insurance is under your parents/guardians name!
Because things are alot different over there i probably would give you wrong ideas!!
Good luck with it amy!!