"You won’t believe this... Sailor has now broken her arm on the monkey bars. Mum’s currently buying Panadol in bulk from Coscto.
"If you want us, we’ll be ordering the family meal in the Denyer Wing of the hospital," Grant captioned the post alongside a picture of his daughter wearing her arm in a sling.
The news comes just weeks after Grant had to be hospitalised for a over a month after he tore his L1 disc while hammering in his garden.
"I was down the paddock, mate, with my Akubra on, my flannos, just slamming away on a star picket with a huge sledgehammer and twang -away it went," Grant told his 2Day FM breakfast co-hosts Ed Kavalee and Ash London.