A bit confusion

Neither.

Only a suspended sentence for the suspect is unfair to the victim's family.

OR

It's unfair to the victim's family for the suspect to only get a suspended sentence.

I usually find myself saying it this way:
"It's unfair to the victim's family for the suspect to only get a suspended sentence"
But I think it is more correct to write it this way:
"It's unfair to the victim's family for the suspect to get only a suspended sentence"

Assuming the suspect has been convicted, of course.

That's true - the term would actually be defendant, even if there is no trial.

Thx for all answers .