Actually your in control at your end, agree or not with how that is treating the inmate is her bad, not yours. That is out of your control.
Although I would bring your question on how would the inmate feel, up to your sister...

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she should get her own POBox,if she wont use her homeadress because her bf would get mad.That's just a reason why she shouldn't try to find a pp,she's not even honest telling her bf about having a pp.

Well I did get a letter today from a PP that I did not write so I knew it was to her.I just wrote return to sender on it and put it back in the mail.I called her and cussed her out!I really think she is too immature to understand why it is wrong to do that.I feel guilty for even telling her about WAP.I was only trying to show her something to do,because she is not working anymore and she is always talking about how she has no one to talk to.I figured it may be a nice way for her to help someone and them in return help her by making conversation.I can clearly see that she is a dumb a**!

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*~Rest In Peace~*
Leslie McNeil Collins 16OCT1930-06FEB01(grandpa)
James Thomas Maples 26DEC58-07MAY07(dad)
Joseph Jordan(Joey) 17APR81-25NOV00(brother)
Scott Hunter Clark 04JUL87-05JUL04(brother)
Aaron James Hensley 04JUL05-05MAY07(son)
The Lord watch between me and thee in our absence from one another.

Ah, the joy of siblings!
A friend of mine had a free world PP (male) that she kept quiet from her BF, they got pretty close over time; of course he eventually found out & all hell broke loose because he was convinced she was up to something with this guy. He very nearly left her but eventually she managed to talk him round...but there's no trust between them now, and without trust in a relationship what do you have?

I think you did the right thing mailing it back to him, hopefully he finds someone else to write to

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"I believe that friends are quiet angels who sit on our shoulders and lift our wings when we forget how to fly."
---Unknown