The boy, who cannot be named because he was underage at the time of the offence, was sentenced in Lethbridge youth court.
The teen admitted to having sex with his half-sibling 10 times in 2010 when he was 14 and she was 11.
The probation includes a daily curfew, a psychiatric assessment and followup counselling.
There is also an order not to contact the victim unless it is approved by the family and the youth's probation officer.
The teen, who is now living with his grandmother, must also attend school.
Also on HuffPost