Anneannem geçen yaz kayısı reçeli yaptığını anlattı, dede de onu dikkatle dinledi.

Anneannem means my maternal grandmother.

It breaks down like this:

• anneanne = maternal grandmother
  
  • literally mother-mother
• -m = my

So:

• anneannem = my maternal grandmother

Turkish often distinguishes:

• anneanne = mother’s mother
• babaanne = father’s mother
• büyükanne = grandmother in a more general sense

So this word is more specific than just grandmother.

Yes. Geçen yaz is a very common way to say last summer.

• geçen = passing / past / the one that just went by
• yaz = summer

Together, geçen yaz means last summer.

You may also hear geçtiğimiz yaz, which is a bit more formal or explicit, but geçen yaz is very natural in everyday Turkish.

Because this is a common Turkish noun compound.

• kayısı = apricot
• reçel = jam
• reçeli = jam of apricot / apricot jam

In Turkish, compounds like this usually work as:

• first noun stays plain
• second noun takes a compound marker that looks like a 3rd person possessive ending

So:

• elma suyu = apple juice
• domates çorbası = tomato soup
• kayısı reçeli = apricot jam

This does not mean the jam of the apricot in a fully literal possessive sense. It is just the normal compound pattern.

Yes, this is one of the most important Turkish patterns for learners.

Yaptığını comes from yapmak = to make/do, and here it means roughly that she made or the fact that she made.

A simplified breakdown:

• yap- = make
• -tık / -dık type ending = turns the verb into a clause like that ... did
• -ı / -i / -u / -ü = possessive marker
• -nı / -ni / -nu / -nü = accusative case

So yaptığını is a subordinate clause meaning something like:

• that she made
• what she made

In this sentence, the whole part geçen yaz kayısı reçeli yaptığını is the thing that grandmother told.

Because the subject of the subordinate clause is not separately stated, so it is understood from context as the same person as the main subject: anneannem.

So the sentence is understood as:

• My grandmother told that she made apricot jam last summer

If the maker were someone else, Turkish would usually show that more clearly, often with a genitive subject inside the subordinate clause. For example:

• Annemin kayısı reçeli yaptığını anlattı = She told that my mother made apricot jam.

So in your sentence, the natural reading is that grandmother herself made it.

Because Turkish often builds that meaning into the verb form itself instead of using a separate word like English that.

In English:

• She said that she came
• He told me that he was tired

In Turkish, the that-clause is often made with endings such as:

• -DIK
• -AcAK
• -mA

So in this sentence, yaptığını already carries the idea of that she made. Turkish does not need a separate standalone word for that here.

Because the whole subordinate clause is the direct object of anlattı.

Think of it like this:

• What did grandmother tell?
• She told that she made apricot jam last summer

That entire idea is the object, so it takes the accusative ending.

That is why you get yaptığını, not just yaptığı.

Very roughly:

• yaptığı = that she made
• yaptığını = that she made, as a definite direct object

Both can sometimes be translated as said/told, but they are not always used in exactly the same way.

• söylemek = to say / to tell
• anlatmak = to tell, narrate, explain, recount

Anlatmak is especially natural when someone is describing an event, experience, process, or story.

So here, grandmother is not just saying one short fact. She is telling about how she made apricot jam. That makes anlattı a very good choice.

De here means too / also / as well.

So:

• dede de = grandpa too / grandpa also

It is written separately because this de is a separate particle, not a suffix.

Compare:

• dede de dinledi = grandpa also listened
• evde = in the house

In evde, the -de is a case suffix and is written attached.
In dede de, the de means also, so it is written separately.

A learner may notice that anneannem clearly means my grandmother, but then the sentence uses plain dede instead of dedem.

That can happen because Turkish often uses kinship words a bit like names or titles when the relationship is already obvious from context.

So:

• dede can mean grandpa
• dedem means explicitly my grandpa

In a sentence like this, dedem de would also be possible if you want to make my explicit.
Using plain dede can sound more conversational or story-like.

Here, onu most naturally means her and refers to anneannem.

• o = he / she / it
• onu = him / her / it

Turkish does not mark gender in third-person pronouns, so the same word can mean:

• him
• her
• it

You understand which one it is from context.

So:

• dede de onu dikkatle dinledi = grandpa also listened to her carefully

Because Turkish normally puts the verb at the end.

A very typical Turkish order is:

• subject
• object
• adverbs
• verb

So:

• onu = her
• dikkatle = carefully
• dinledi = listened

Literally, it is closer to:

• her carefully listened

That is normal Turkish word order.

Turkish word order is also somewhat flexible, but the verb at the end is the main pattern.

Dikkatle means carefully or more literally with attention.

• dikkat = attention / care
• -le = with

So:

• dikkatle = with attention

This is a common way Turkish forms adverb-like expressions.
Another possible form you may hear is dikkatlice, which also means carefully.

In this sentence:

• onu dikkatle dinledi = listened to her carefully