Family relations in the gothic language

[kevin.behrens@rocketmail.com]

Hello,
I wondered and tried to do some research about how the family relations were called and which system it was in the gothic language. In the dictionary by Köbler there are just some basic words like "mother" or "brother". So, what were or might have been the words for "great grandmother" or "cousin" or "big brother" etc. 
If you have any sources or ideas, I would be really thankful.
Greetings,
Kevin

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