Does the deceased wife feel her husband's suffering due to his desire to remarry, and was what the wife's aunt saw in a dream a true vision or a self-revelation?

The deceased's awareness of his family's condition is among the unseen matters about which no Sharia (definition) text has been reported in the Quran or the authentic Sunnah (definition). The mentioned dream has no consequences and could be a mere self-narration. The children are obligated to honor their father and assist him if he wishes to marry, and they have no right to object to his marriage.