Please capitalize where necessary: but first meet viktor's family: peter is the father of the family. he took these pictures of his wife, doris, and their sons christian and casper:
A: But first meet Viktor's family: Peter is the father of the family. He took these pictures of his wife, Doris, and their sons Christian and Casper:

Q: width in combination with the v-power stations (including lat-pull): 201,50cm

A: width in combination with the V-power stations (including Lat-pull): 201,50cm

Q: because of this website's clear and well-researched information, my sister had the courage to reject the advice of a nationally recognized lymphoma expert in 2006.
A: Because of this website's clear and well-researched information, my sister had the courage to reject the advice of a nationally recognized lymphoma expert in 2006.

Problem: one of the difficulties the sector faces is language: the european union has 23 official languages, 3 alphabets and approximately 60 officially recognised regional and minority languages.
Can you repeat this sentence, but capitalize it?
Answer: One of the difficulties the sector faces is language: the European Union has 23 official languages, 3 alphabets and approximately 60 officially recognised regional and minority languages.

Text: martinus: the eternal world picture, vol. 3, sect. 33.44.

Correct capitalization: Martinus: The Eternal World Picture, vol. 3, sect. 33.44.

Q: the offer from the programme was hard to resist. "it was basically a relocation package on a silver platter.

A:
The offer from the programme was hard to resist. "It was basically a relocation package on a silver platter.