SACHIN K WADKAR - residential locality - sunder shawas housing society Pune Maharashtra

I have twin daughters now +2years old and they get full of joy when a sparrow comes in our terrace. We have kept a bowl of water for birds (lots many pigeons also visiting) also we put some grains for them.
I have also downloaded some animated songs in which sparrows and other birds sings and dances and i can see a cheerful glory on faces of my daughters, in turn heartfull of hapiness, satisfaction to me and my wife. I know this is due to sparrows, pigeons and other birds in my locality.

I want to know somthing about how to help them to grow? means how can help them to build a nest on my terrace or near by locality, may be some ready made nest arrangements available or some technics to attract them. If some one help me to have some information about this i will be thankul to them.