First of all, don't plan to take your kids out in open areas during this hectic summer whther. They will get dehydrated easily and may fall sick. The best places are the malls where there are kids' play ares.

For clothing you may visit places like Sana Fashions and the New World Ceneter. But most of the hyper markets in malls also have a good stock of cloths for a lesser price (Carrefore/ lulu hyper/ Giant stores)