Here are the correct options to complete the dialogue:
Mrs. Jones: Hello, Ryan! How are you? How are your mother and your brother, Alex?
Ryan: Hi, Mrs. Jones. We're all very well. Mum's really happy! She’s going to get married on Saturday!
Mrs. Jones: That's wonderful! So, who is he?
Ryan: A really nice man called David. I like him.
Mrs. Jones: So, your life is changing?
Ryan: Yes, it is!
Mrs. Jones: Are you moving to a new house?
Ryan: Yes, we are. After the wedding, Mum and David are going on holiday for a week. Alex and I are staying with our grandparents. Then we are moving to a bigger house. It's got three bedrooms. I won't share a bedroom with Alex anymore!
Feel free to ask if you need any more help!