Fotoğrafçı erken geldiği için aile fotoğrafını nikâhtan önce çekebileceğiz.

Because geldiği için is a subordinate clause meaning because he/she came or because the photographer came.

In Turkish, when için follows a verb clause like this, the verb usually appears in a nominalized form:

• gel-diğ-i
• come + clause marker + 3rd person marker

So:

• Fotoğrafçı erken geldi = The photographer came early.
• Fotoğrafçı erken geldiği için = Because the photographer came early

A plain geldi is a main-clause form, so it would not fit naturally in this structure.

Here it means because.

için has more than one common use:

• after a noun/pronoun: for
  • senin için = for you
• after a clause: because / since
  • geldiği için = because he came

So in this sentence, erken geldiği için means because he arrived early.

It means the family photo or the family photograph as the direct object of the verb.

The base expression is:

• aile fotoğrafı = family photo

This is a Turkish noun compound. The second noun takes a compound ending:

• fotoğraf → fotoğrafı

Then, because it is a specific direct object, it also takes the accusative:

• aile fotoğrafı
  • -nı → aile fotoğrafını

So:

• aile fotoğrafını çekmek = to take the family photo

Because the word already contains the compound/possessive-type ending -ı in fotoğrafı.

When Turkish adds another vowel-initial suffix after that kind of ending, it commonly uses a linking -n-:

• fotoğrafı
  • accusative → fotoğrafını

So the structure is:

• aile fotoğraf-ı-nı
• family photo + compound marker + accusative

That n is a normal linking consonant here.

It breaks down like this:

• çek- = take, shoot, pull
• -ebil- = be able to, can
• -ecek = future
• -iz = we

So:

• çekebileceğiz = we will be able to take

In this sentence, because the object is fotoğraf, the meaning is specifically:

• we will be able to take the photo

Because Turkish often leaves subject pronouns out when the verb already shows the subject.

Here, -iz in çekebileceğiz already tells you the subject is we.

So Turkish does not need biz unless you want emphasis:

• çekebileceğiz = we will be able to
• biz çekebileceğiz = we will be able to

The version without biz is the normal neutral one.

nikâhtan önce means before the wedding ceremony.

Breakdown:

• nikâh = wedding ceremony, marriage ceremony, often the formal/legal ceremony
• -tan = ablative ending, here used with önce
• önce = before

Turkish normally uses the ablative before önce and sonra:

• nikâhtan önce = before the ceremony
• nikâhtan sonra = after the ceremony

So the -tan is there because önce requires that pattern.

Yes. Fotoğraf çekmek is the normal Turkish expression for to take a photo.

Even though çekmek has other meanings in other contexts, with fotoğraf it means to take/shoot a photograph.

Examples:

• Fotoğraf çekiyorum. = I’m taking a photo.
• Aile fotoğrafını çekeceğiz. = We will take the family photo.

So this is completely standard Turkish.

Because the sentence describes:

1. a reason that has already happened
2. a result that will happen later

So:

• erken geldiği için = because he arrived early
• çekebileceğiz = we will be able to take

This matches the logic of the sentence very well: the photographer’s early arrival happened first, and because of that, taking the photo becomes possible in the future.

English does the same thing:

• Because the photographer arrived early, we will be able to take the family photo...

Not completely, but the given order is very natural.

The sentence is arranged like this:

• Fotoğrafçı erken geldiği için = reason
• aile fotoğrafını = object
• nikâhtan önce = time phrase
• çekebileceğiz = verb

Turkish usually puts the main verb at the end, and other parts can move around for emphasis or focus. But this version sounds neutral and standard.

So the sentence order is not the only possible one, but it is a very good default order.