Ugh I hate when characters about to die always think they should or could be forgiven like wtf stop using your death to make people pity you when you know you did something terrible.
did you unironically write this? it's normal for characters who are about to die to basically lash out all their regrets,doubts and ask for forgiveness since you know,they are gonna die and it's their last chance to speak to that person,in this case,her sister.
also those character don't think "they should or could be forgiven",where did you see that? they are asking for forgiveness,not demand it (the latter in entitlement), it's 2 very different things