Clearly I have namechanged!!
I committed a "breach of trust" theft 5 years ago, was caught and admitted my guilt at arrest. The amount was much, much less than your brother, but the "type" of theft (medication) was very serious.
I was lucky to be given a probation order, for one year. This was because I was prepared to subject myself to character reports, psychiatric reports etc which took quite a long time (over a year) to be fully completed. The initial sentence should have been imprisonment under the misuse of drugs act, but because of my swift guilty plea and remorse, as well as the reporting, I was eventually charged with theft rather than MoD and so got a much lighter sentence.
It is hard - everyone in our community knew about it, it was hard for my dh and luckily my kids were then too little to know - we will tell them sometime, but haven't as yet. But the small community we live in was fab - we would come home from a day in court to discover people had cooked us dinner and left it in our porch! Our freezer was overflowing for weeks with home-cooked food and more cakes than we could eat! I have a huge pile of cards from people locally who sent me stuff to say that they were behind me and supporting me.
My dh has totally stuck by me (though his reputation was affected, including his job). I know I am lucky. My Dad also stood by me and was very supportive - my Mum (parents have been divorced since I was very small) chose not to support me and cut off contact as she couldn't cope with the fact that her daughter was a "criminal".
I don't know how to deal with prison, though I did spend a night in the cells after I was arrested - imagine explaining to a police officer that your dh will have to bring your baby daughter in for nightime breastfeeds!!!
I hope you can be supportive of your brother and his family - the support of my family that was given was so important to me and has really cemented the relationships it didn't sour. You sound like a lovely sister!