Thanks for your question.
The bad news is that you cannot make an application for a Dependants Visa for yoru brother if he is not wholly financially dependant upin you. As your brother is married and has his own family, he will only be entitled to apply for a Visitors Visda and not a Visa for Settlement unless he meets the requirements of the Immigration Rules for one of the various Visas.
If you wish to discuss, please feel free to ask further questions.
He can come as a visitor, however, if he wishes to live and work, he will have to make an application under one of the various visa categories.
I am not 100% satisfied about your answer.I am still in doubt.For instance=if he comes to England as a visitor I mean with his visitor visa.Can I help him in England to get him LONG-TERM(2 and 5 years extended visitor visa or Can I help my brother in England to get him work permit.Also Can I send my supporting documents to my brother so would be helpful then he can apply for visitor visa or other visas(Dependant,work permit,long-term extended visitor visa(2 or 5 years)Does he need financially(money)from me?So I can send money to my brother's bank account in Istanbul/Turkey then he can show his bank account to British Embassy in Istanbul/Turkey so British Consular can get satisfied.Also can't I sponsor for my brother from England?When you fully answer my this question then I will pay for you.
You cannot switch from a Visitors Visa to any other category, therefore, you will be unable to help your brother to stay long term.
If his intention is to work, he will have to make an appliaction for a Tier 1 general Visa as this would allow him to work and stay longer than 6 months.
You may sponsor a Family Visitor, however you will unable to sponsor a work visitor unless you have the appropriate licences.
As a visitor, he will need to show that he will be able to financially maintain himself without recourse to public funds. You will be able to assist by preparing a Statutory Declaration stating that you will financially maintain and accomodate him for the duration of his stay.
Any application your brother makes, whether it be for a Visitors Visa or a Tier 1 General, he will have to make this from Turkey. You will be able to send him documents in support of his aplication.
I hope this helps.
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