To take a recent case that is still ongoing, everyone is saying that if Arias gets life it wil mean life, who is to say that case won't be overturned by a panel of parole judges. Botom line is, this killer can move in next door to any one of us now. Do the judges think she will move into their fine neighbourhoods? Hell No! It's more likely she will move in next to you or I
That still doesn't explain why it's wrong for the victim's grandson to speak on her behalf. Even in your example, if Arias comes up for parole way down the line and the Alexander family somehow gets a change of heart and forgives her, are you going to say what the Alexander family is doing is wrong vs. if they go there and say 'keep her *advertiser censored* in jail'?
I dunno, it sounds like a double standard. It's ultimately on the parole board/judge to decide to reverse a sentence, not the victim's family.