Is it really posible for a human to forgive and forget someone that made your life miserable?

My older sister's former tormentors are now her MIL and SIL. They treated her horrible when she and her now husband were in their 1st year of their relationship. Many years ago.

Even though the tormentors apologized and expressed remorse, followed by actions over the years, can a human truly have such a forgiving heart?

I get that she forgive but she also now has a close, great relationship with them. Is that possible, to forgive and forget to the point of really adoring/liking them?
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I've heard of forgive but never forget but my sister trusts them by now. Everything has been rebuilt. Can a human get to that point... of actually really forgiving and forgetting your former bully or tormentor (that person that hurt you emotionally) that they become your allies in the end?

I'm having a hard time that a human can be that forgiving.
Is it really posible for a human to forgive and forget someone that made your life miserable?
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