In the begging of act two of All My Sons I think that Annie was sent there by her dad to find out stuff about Keller. Annie probably isn't really in love with Chirs. She's just doing that to get closer to him and his family. Anni and Chris won't get married. George is coming to the Kellers house too. George is a lawyer and probably had good news to tell his dad about how they can put Keller back in jail and get Steve out. That's why he took a plane to come see him in jail. Annie and George are just there to get some information to put Joe back in jail.