SA man in court over grandfather's murder

A 22-year-old man has faced an Adelaide court charged with the stabbing murder of his grandfather and with causing serious harm to his grandmother.

Austin Smith came before Adelaide Magistrates Court on Wednesday and was remanded in custody to appear again in October.

The charges relate to the death of 81-year-old Stanley Broadwood and the wounding of his wife, 78-year-old Marie Broadwood, in an attack at their home at McLaren Vale, south of Adelaide, on Tuesday night.

Mrs Broadwood was taken to Flinders Medical Centre in a serious condition.

Relatives said they were devastated by the tragedy.

"Stan was a loving husband, father, grandfather and friend and will be dearly missed by all who knew him," the family said in a statement.