Your PSA levels may be within normal standard levels but for a son of a PCa patient at higher risk for the disease the control would be better including other markers, such as free PSA, PAP, etc.
In fact your worries are correct because of the aparent constant increases.
In any case, do not get "precipitated" on conclusions but be vigilant. A PSA above 2.5 ng.ml would be highly suspicious.
Best.
Baptista