Present study has two purposes. One is to develop a hypothetical model on foster parent\u27s psychological development which they experience throughout the period of fosterage. Another purpose is to present the first evidence which supports the validity of new concept \u27Disturbing fact relevance around telling\u27 ,which is peculiar phenomenon to Japanese foster parents and which is broader concept than preexisting concept \u27telling\u27. \u27Telling\u27 means foster parents confession to their foster children that they aren\u27t real parents. On the other hand, \u27second telling\u27 means foster parents\u27 confession to their foster children and sometimes to their significant figures (e.g. teachers, neighbors, relatives, etc.) that the parent-child relationship is not real and terminable one. Because it is difficult for children to understand their special parent-child relationship, foster parents often need to explain the relationships repeatedly. In this study, eighteen foster parents were interviewed in semi-structured manner. As a result of the M-GTA analysis, 112 concepts, 31 categories, and 8 category groups were extracted. These results will contribute to new Japanese fosterage system
