Hi Ishita, Dubai will be an ideal destination for your family holiday. It has everything, be it beautiful ocean, golden desert, delectable cuisine, ultra-modern infrastructure, theme-parks and much more to keep you awed during your trip. You can read more about Dubai here: https://goo.gl/f1dTkQ You can explore more options for your memorable family holiday here: https://www.tripoto.com/family-vacations-destinations Do let us know if you need any further help in planning your trip. Keep travelling!
You can go for Dubai as it would be a central location from Europe as well as Asia and i also beleive it is a good place to spend a time with your family. My recent visits to Dubai have always been that of family trips so its really rejuvenating.
Consider a time after August as the weather is more pleasant at that time.