Received: 12 th October 2021 This research was conducted at SLB N Angkola Timur, South Tapanuli Regency by involving parents of mentally retarded students in the school environment. Respondents were taken randomly based on the willingness of parents to fill out the questionnaire. The data collection tool uses questions in a questionnaire, with a total of 10 respondents. The purpose of this study was to see the relationship between learning assistance for mentally retarded students at home by their parents and increasing the ability of the students themselves. So that children are able to be independent in the future. The data analysis technique used linearity test and simple linear regression analysis. The data processing tool uses SPSS version 25. And the results show 1.00 so that every one unit increase in the parental assistance variable will increase the child's ability by 0.25 units. And conversely a decrease of one unit in the parental assistance variable will reduce the child's ability by 0.186 units. So that the improvement of children's abilities depends on parental assistance at home.