Xiaocheng, yes you must really clean your house. I feel your house have too much old things like old and unwanted boxes..old toys..old clothes etc…. Everything you do not use must throw away. Everything you want must be kept inside the cabinet and not anyhow throw on the shelf, table or on the floor. A clean and neat house will not only let the family live happily and healthily it will also bring good fengshui to the family too. Also you need to open up your balcony windows to let the fresh air come in. I suggest you buy 2 apartments in the same block. One unit for you, qiangzi and the kids to stay. Another unit is a smaller apartment for your in-laws. It’s not good to stay with in-laws..though they are nice in-laws. At present your this house is good enough for your family. It’s just too messy.. you both need to clean up and throw all the rubbish away. Your present house is quite big..unfortunately your house have plenty of things.😮Wait till the property is stable then you can decide to buy a new house.