2 children sometimes need to share 1 room. We offer design solutions such as wardrobes and shelving units that can be cleverly used as room dividers.
You could move the living room into the master bedroom, sleep in the children's room and transform the original living room into a big children's room.
However, this solution will not work forever. Teenagers rather "move away" from their parents and are happy with a smaller room in the home as long as they have their own space to feel comfortable in and be with their friends. Have a look at a possible design of a teenager's room.