1.12 A pilot shall not commence a flight and an operator shall not roster the pilot for a flight unless during the 7 days period terminating co-incident with the termination of the flight he or she has been relieved from all duty associated with his or her employment for...
Travelator is partly correct, Ixixly gives the answer I agree with. The duty limits apply for commercial work only.
You can take your son flying and log it on the correct day.