My proposal maintain your idea of one big living room and the kitchen in another room .
I gave to the kitchen enough space to host your old one.
Close to the main entrance there is a small guest bathroom, then the laundry room and the kids bathroom.
The main changes in the plan are for the master bedroom and the studio .
The master bedroom has a huge bathroom as well as a big closet divided into two part , one part is in the room another part before to enter the toilet as a walk in closet .
The kids rooms are very simple and similar .
The studio is made up of three rooms : one is the bedroom or studio, the toilet and the small kitchen corner.
thank you