I cannot speak towards the German law aspect of this question, however you could repost this part of the question and ask that the admin team post this in a German law category. In terms of you application for asylum in the UK obviously I cannot speak to what the Home Office will ultimately decide. However, if they are satisfied that you would face persecution or threat to life/family should you return to your home country then they would likely grant you asylum. In terms of moving to the UK based on your paternal mother, you could look at making an application to the home office.
I shall provide you with a helpful link that will assist you in finding a solicitor/representative near your local area. This will provide you with someone nearby your area who can assist you if required.
I hope this information proved helpful. You will find a local solicitor who deals with these matters on the law society webpage which is as follows;
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