A three-year-old boy has died just days after a motorway crash that also killed his four-year-old sister, family members have said.
The accident happened on the M4 westbound carriageway near Newport in South Wales, prompting a huge emergency services response on the afternoon of Saturday 5 February.
Four-year-old Gracie-Ann Wheaton, from Tredegar, died in hospital in the early hours the following day, while her three-year-old brother remained critically ill in hospital.
Relatives have now said that the little boy has also died.