Which bedroom is better for the elderly in Feng Shui?

According to common sense, the son and his wife sleep on the east side, because the old man gave up the room with the best lighting.

If you are filial enough, you can give up the east side, because the west side is in the evening. The sun is shining and it is sultry. Young people often turn on the air conditioner, but the elderly are reluctant to turn it on.

The activity space in the back is relatively small, so it is reserved for the third generation who lives alone.