Evaluation of effect in short term of the parents school program (PSP) about the family environment and the different results between participating and non-participating parents. A cohort study was performed on 112 parents of students from the High School 5 (University of Guadalajara) during six months, 61 parents received the program (intervention group, IG) and 51 were the control group (CG). The program was made in 17 weekly interactive meetings, where the topics were: adolescent psychology and sexuality; parent-children relationship; family communication; self esteem; and addiction prevention. All of these topics were discussed. To evaluate family relationship the key word used was: How is your family relationship? There were found at baseline, a smaller family, and lesser family income in the IG. On the other hand, the CG showed higher scores on satisfaction with the academic and work performance; participation and problem solving; power, money and sex; and life satisfaction. At the end of the program, only 4% subjects of the IG and 59% of the CG were available for assessment. At this point we found that all differences have disappeared except life satisfaction, In addition new differences appeared as: in the control group there was a higher score for children's problems, and satisfaction with life. On the other hand, the IG showed an increased score on professional support searching, a lower score in parent-children communication. Our findings suggest that parents who voluntary received the PSP came from vulnerable families. The program improves the search for Professional support.