Devon and Cornwall police have given an update on the investigation into Sunday's speedboat crash in Padstow, Cornwall.
Earlier, it was confirmed that BSkyB executive Nick Milligan had been killed along with his eight-year-old daughter.
Detective Superintendent Jim Colwell said that a 39-year-old woman and her four-year-old son suffered "serious, potentially life changing injuries".
A 12-year-old and 10-year-old girl suffered minor injuries in the accident.
A father of four who was killed in a speedboat accident along with his eight-year-old daughter doted on his family", his brother has said.
Two people have died and another four people have been injured in a speedboat accident while on holiday in Cornwall.