Hi, thank you for your question. Given the seriousness of the allegations he will most certainly require legal advice and representation and I would suggest you check here to find criminal solicitors to approach to represent him: http://solicitors.lawsociety.org.uk/
You should narrow down the search by selecting area of law: crime
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To whom has he admitted this?
Where in the country are you?
Will his siblings give evidence? How old are they?
can you respond to my questions?