It depends on your lifestyle, if you like spending money on women cars coke and flashy housing, you won't be saving any money.
If you rent a 1+1, use taxi and public transportation or a bike you should be able to save much more than half of it. Going out to eat and drink is cheap compared to Europe. It's about finding a decent housing for a decent cost. Bring electronics from abroad. Taxi is cheap to use but no speaks english.
With a family and commuting, I think it would be difficult to save money. Istanbul is not cheap but it costs only a fraction of what living in the sandpit will set you back at. A decent 1+1 or 1+2 will cost you only 700 euros if you spend some time looking around. Groceries are pretty cheap as well.
However, the rosters are horrible and extremely commuting unfriendly. More than three days abroad per month is not realistic.