Police are appealing for public assistance to help locate missing Frankston mother Felicity Loveway and her son Adrian Meneveau.
The 83-year-old and 56-year-old were last seen at 7am on 11 December at Olivers Hill boat ramp in Frankston.
The pair told family they were going on a trip for a couple of days on their boat, registered ER422.
The boat is described as having a blue hull with a white top and a blue canopy.
Anyone who sees Felicity or Adrian or knows the location of their boat is urged to contact Frankston Police Station on 9784 5555.