Rules and regulations

We live in an apartment of 4 floors and there is no rules regarding the timings of kids playing. The association didn't mention any specific timing for the kids to play. If they are playing in morning we have no problem ..If they are playing in evening we have no problem ( in corridors common passage area next to our 2 main rooms ) but playing shouting screaming at 10 or 11 in night is not acceptable..My mom is a patient she needs to take medicine and sleep but the noise created by the group of 10-12 kids irritates alot and even after closing the windows and doors it's hearable inside rooms. The association is not ready to mention times and says it's ur personal issue we can't do anything and even after telling the tenants about this problem they are not ready to listen ..What can I do now? As association is not ready to take any step and help us ..We have a huge fight with the person who is living below our house as he had problem with the sound of crushing a ginger for the tea ..For such a small reason he fought with us ..What can I do with this when group of kids are creating noise at 10 or 11 in night .. Please help