Simplify the following text for a Grade 3 native English-speaking person.
Original: State Premier Peter Beattie described Irwin as one of the state 's greatest cultural ambassadors . On 15 November , Irwin 's widow Terri and children , Bindi and Bob , remembered his life and achievements on `` Steve Irwin Day . ''
Simplified: Irwin 's mother and father were Lyn and Bob Irwin .