I don;t have personal experience in this matter yet but in my opinion it is ridiculous to split everything in half..if you do so then it is kinda like you are living with a business partner..anyways I think there should be a mutual understanding and if husband pays the rent then  wife should pay other bills like utilities, cell phone etc or vice versa....and both should open a joint saving account and put part of their income in that saving account for the future.

Also, in my opinion it is completely ok to give money to your in laws..I can;t understand why one would even think twice before giving money to their own parents...after all whatever I am today I am because of my parents so I would definately give them money whenever they need it and I would expect my Man to give money to his parents whenever they need it..no questions asked.