Tris007

Hi there, Hope someone can help me with this one. I am a british citizen and my fiancee is an australian citizen with dual citizenship in the Uk, I have a british passport and my fiancee and her 2 children have australian passports. We are all re-locating to the UK in July and wondered how it worked regarding just coming back and living.I live here due to work and i am fully employed. So can we just fly here and just settle as i am a british citizen and my fiancee has duel, and the children will inherit it from their mum. Can my fiancee and kids be able to travel one way with just an australian passport. Do we fly here and apply for british passports when we arrive and apply for the british citizenship for the girls when we arrive. Sorry for all the questions. Thanks in advance for any help Tris