Det som gör mig glad är att farmor alltid kommer ihåg att ta med blåbär eller hallon.

Because det som means the thing that / what in a statement like this.

• Det som gör mig glad ... = What makes me happy ...
• Vad is mainly a question word: Vad gör dig glad? = What makes you happy?

So here, det som is the natural choice because the sentence is not asking a question. It is identifying the thing that makes the speaker happy.

Because mig is the object form of jag.

• jag = I
• mig = me

In gör mig glad, the verb gör affects me, so Swedish uses the object form:

• Det gör mig glad = That makes me happy

Using jag here would be grammatically wrong, just like That makes I happy would be wrong in English.

Literally, it means makes me happy.

• gör = makes / does
• mig = me
• glad = happy / glad

So Det som gör mig glad is very close to English in structure:

• The thing that makes me happy

This att means that and introduces a content clause.

So:

• Det som gör mig glad är att farmor alltid kommer ihåg ...
• What makes me happy is that grandma always remembers ...

It connects the first part of the sentence to the idea being explained.

They do two different jobs.

1. är att farmor alltid kommer ihåg ...

   • here att = that

2. kommer ihåg att ta med ...

   • here att = to

So:

• first att introduces a clause: that grandma always remembers...
• second att marks the infinitive: to bring

This is very common in Swedish.

Because this part is a subordinate clause:

• att farmor alltid kommer ihåg ...

In Swedish subordinate clauses, words like alltid, inte, ofta, and similar adverbs often come before the finite verb.

Compare:

• Main clause: Farmor kommer alltid ihåg ...
• Subordinate clause: ... att farmor alltid kommer ihåg ...

So the word order changes because of the att-clause.

Kommer ihåg is a fixed expression meaning remember.

Even though kommer by itself usually means comes, in komma ihåg the whole expression means to remember.

Examples:

• Jag kommer ihåg det. = I remember it.
• Hon kom ihåg nycklarna. = She remembered the keys.

Another common Swedish verb for remember is minnas, but komma ihåg is extremely common in everyday speech.

Ta med means bring along / take with you.

• ta = take
• med = with
• together: ta med = bring

In this sentence:

• komma ihåg att ta med blåbär eller hallon
• remember to bring blueberries/bilberries or raspberries

Swedish often uses verb + particle combinations like this.

In Swedish, family words are often used without a possessive like min when they function almost like a name.

So:

• Farmor kommer snart. = Grandma is coming soon.
• Jag tycker om farmor. = I like Grandma.

This is very natural in Swedish.

You can still say min farmor, but that usually feels a bit more descriptive, like my grandmother rather than simply Grandma.

No. Farmor specifically means father’s mother.

Swedish distinguishes between the two grandmothers:

• farmor = father’s mother
• mormor = mother’s mother

So this sentence is specifically talking about the speaker’s paternal grandmother.

Because Swedish normally does not capitalize family words like farmor, even when they are used in a name-like way.

So Swedish writes:

• farmor
• mamma
• pappa

English may sometimes capitalize Grandma when used like a name, but Swedish usually keeps these lowercase unless they begin the sentence.

Because the sentence is talking about an unspecified amount of berries in a general sense.

• ta med blåbär eller hallon = bring blueberries/bilberries or raspberries

Swedish often leaves out the article in this kind of plural or mass-like meaning.

If you wanted to be more specific, you could say things like:

• ta med några hallon = bring some raspberries
• ta med hallonen = bring the raspberries

But here the general, article-less form is the most natural.

It is best understood here as a general plural or an unspecified quantity.

A useful thing to know is that blåbär has the same form in indefinite singular and indefinite plural:

• ett blåbär = a blueberry / bilberry
• blåbär = blueberries / bilberries

In this sentence, context makes it clear that we are talking about berries in general, not just one single berry.

In many learning materials, blåbär is translated as blueberry, and that is often good enough.

But in Sweden, blåbär usually refers to the small wild berry that is more precisely a bilberry. It is not always the same as the larger cultivated blueberry common in English-speaking countries.

So:

• everyday translation: blueberry
• more exact botanical idea: often bilberry

Yes. That would be a complete sentence meaning:

• Grandma always remembers to bring blueberries/bilberries or raspberries.

The original sentence is longer because it frames that whole idea as the thing that makes me happy:

• Det som gör mig glad är att ...
• What makes me happy is that ...

So the extra structure adds emphasis to this is what makes me happy.