Do without the useless apartheid of parents and children in the bathroom. Without the stupid wall, you can rather partition off a chamber for the washing machine, dryer, and redundancy pot from the total bathroom area and still have space for a bidet. Then a double washbasin is worthwhile, otherwise not: synchronized shaving/makeup is done at best by honeymooners, in everyday life one person times their tooth brushing during the other's shower usage. In practice, this works perfectly, chaotically spontaneously organized, completely without Erlang or Kendall