Kaikesi married Vishrava on the advice of her father Sumali to give birth to powerful children.
She approached Vishrava at an inauspicious time (twilight)
Vishrava warned that such timing could affect the children's nature
👉 As a result, their children had different personalities and qualities
đź‘‘ The Four Siblings
1. Ravana
Eldest son
Extremely powerful, intelligent, and a great devotee of Shiva
Became the king of Lanka
2. Kumbhakarna
Giant with immense strength
Known for long periods of sleep due to a boon
Loyal to his brother
3. Vibhishana (you wrote "Vidhisha")
Kind, wise, and righteous
Followed dharma
Later supported Rama
4. Shurpanakha
Their sister
Her encounter with Rama and Lakshmana started major events in the story