This research aims to: 1) find out the implementation of Islamic Religious Education in the family, 2) find out the students’ religious behavior, and 3) find out if there is any correlation between Islamic Religious Education in families and students’ religious behavior at MTs Pon Pes Al Iman Muntilan. This is a quantitative research with the students of MTs Pon Pes Al Iman Muntilan as the population. The data were collected through questionnaire, interview, documentation and observation. The test was given to 30 respondents. The instruments analysis includes validity test using product moment correlation technique and reliability test using Cronbach’s Alpha. The questionnaire validity test shows that from 30 independent variable questions about Islamic Religious Education in families, there were 27 valid questions, and for the dependent variable on students’ religious behavior, there were 21 valid questions out of 33. Reliability test shows the reliability score (Cronbach’s Alpha) for Islamic Religious Education variable in families is 0,934, while on students’ religious behavior variable is 0m913 and are declared reliable. The pre-required analysis tests used in this research were normality and linearity tests. The data was then analyzed using product moment person descriptive and correlation. The research result shows: 1) Islamic Religious Education in families is generally in excellent category with the proportion of 96,29%. 2) The students’ religious behavior at MTs Pon Pes Al Iman Muntilan is generally in excellent category with the proportion of 68,51%. 3) There is a positive and significant correlation between Islamic Religious Education in families and students’ religious behavior at MTs Pon Pes Al Iman Muntilan proven by the coefficient value of product moment correlation (rxy) that is 0,277 and sig. value of (2-tiled) 0,042<0,05.