In simple terms, if one spouse dies the surviving spouse automatically inherits 25% of the deceased's estate (they then own 5/8 of property) and the other 75% is shared out (equal percentages) between their offspring.
If you both go at the same time, I believe the estate in its entirety goes to the children and again is divided equally between them.
I've been told (not 100% sure) that it is possible for an inheritor (in this case one of your kids) to sign a waiver that they do not wish to inherit which could make it simpler to get it all in the name of the surviving spouse. I've also been told, again this is purely anecdotal, that it is possible for your children to "inherit" an immovable asset while the parents are still alive!
Nothing is "automatic" and if you're not Turkish, a decent solicitor is a necessity.
To be honest, Turkish inheritance law can be both a nightmare and a minefield to anyone not used to the principle of "reserved portions" and the combinations of disbursement when there are no children can go back as far as grandparents!
Without wishing to stir up the grand debate over the validity of a Turkish will written by a non-resident, in my (limited) experience Turkish probate courts have mostly applied Turkish inheritance law irrespective of what a will said, or didn't say.
I'm no expert so happy to be corrected on any of the above!
JF