An 83-year-old man and his son's live-in partner were stabbed to death allegedly by his grandsons in Uttar Pradesh's Kanpur Dehat district in the early hours of Thursday, police said.

The deceased were identified as Ram Prakash Dwivedi (83) and his son Vimal's live-in partner Khushbu (30). Vimal (63) was seriously injured in the incident that took place in Amrodha town, they said.