Hi Lau,
I am the grt granddaughter of Niels Ditlev YTTING - the brother of Ester Louise. As you would already know there were also Pouline Marie, Ane Marie, Fritz Frederick & half brother Laurs Peter Frederik Carlsen.
Niels came out to Sth Australia in 1874 and then moved over to Western Aust. in 1901 with his young family. As well as having a lot of information on his life in Australia, I also have a bit on his family in Denmark, including some photos of Carl Friderich & Anne Marie with their young children. Perhaps you have photos also?
I have,(with the help of fellow researchers)managed to trace the family line back to 1725.
Can you let me know how far back you have gone with your research? Hopefully we can help each other with the exchange of information.
If it is any easier my email address is - colmain@westnet.com.au.

Best wishes
Coleen