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I am a Solicitor and will assist you.
I must tell you that under current UK laws is not possible to adopt an adult. I appreciate that this is not what you wanted to hear but I do have to be honest with you and tell you the legal position. For an adoption in the UK then a Judge has to be satisfied that the child was under the age of 18 when the adoption application was made.
If the surname has not legally been changed then this can be achieved through a change of name deed. You can also make provision for him in your will.
I hope that this helps you.
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