I have received constant 'sorry's' from one brother, who went on to escalate his abusive behavior more and more every time I saw him, for the last 20 years...so sorry means nothing when it comes from the mouth of someone who has it in their personality to be abusive.
From my father, and mother, no apologies, only them telling me I have to forgive them because they are old...and purely so they can feel that they've been let off the hook for things they don't even know they did, because all their behavior has been unconsciously acting out behavior done to them, or as a result of their own issues that they refuse to look at.
My mother did confess to needing to change...and it seemed real...but then she turned around and did a 360 degree turn back to her old ways, and it turned out to be more manipulations to get me to see them again. She never meant it.
Saying sorry seems to be the hardest thing for most humans. I never found it that hard that I couldn't do it...uncomfortable yes, and I had to surrender my pride and ego and admit that I hurt someone, which felt bad...but this is something they cannot let themselves do, because it is too uncomfortable to see how they really are, as opposed to how they see themselves through their egos illusion.
I think just the acknowledgement would help so much, but I am not holding any hope of that to happen, and they won't get the chance to now anyway. I am not opening myself up to any more of their behavior, so even if they want to apologize, they won't get the chance to now. I sense that they know deep down what they've done, but they just cannot bring themselves to say it. I've heard so many lies and falseness and deceit from them in my life that I wouldn't believe it anyway. My mother almost had me convinced last time, but I never quite believed her.
I agree with warathome...sorry isn't enough. Sorry means "I will never do that again" and that's not something any of them can promise, and mean. They have already proved it to be true so many times. If I could be sure they really knew what they were sorry for, then it would help definitely...but they are such good actors.