400 KWD (about 105,000-110,000 INR) is a solid mid-level salary in Kuwait. With employer-provided housing, a family of 4 can live comfortably and save 80-150 KWD/month. Without housing, rent consumes 150-250 KWD and savings drop sharply.
Kuwait has excellent Indian and Filipino schools at affordable rates. Food costs are moderate. The key variable is always accommodation.