I am coming with my 2 children.
They are 6 and 11 years old.
Any suggestions.

The most obvious answer is the Science Park.

There is a large science museum with lots of fun hands on activities.
There is normally some temporary exhibitions which are very good for children.

In the last few years there have been exhibitions on dinosaurs, arctic explorers, predators, automatons etc.
All of them are also designed to be interesting for children.

The birds of prey display is absolutely brilliant.
The falcons fly up into the air and then swoop down just over your heads to catch the meat being twirled around by the experts. You can see the owls up close.

The web site is here.
https://parqueciencias.com/eng






 

Unfortunately there are not many public play areas for kids with swings and slides etc.
This is strange for a country would love children so much.

However, there are areas with swings and slides in these places.

Campo de Principe.
You can sit a have a coffee at a terrace bar and still keep an eye on the children.

In the middle at the top of this map
https://granadamap.com/29.htm

This is a photo


Garcia Lorca park.
Go down Recogidas from Puerta Real.
Its on the big Arabial road at the bottom.

This is a photo




There is a page with an idea for a game with kids in Granada here.
https://granadainfo.com/pamela/granadas.htm