Anders brothers name was Jens Mortensen Ostergaard. However, there was an Ostergaard household in Alsted Parish, only 2 or 3 miles from where my ancestors lived. In this household, according to an 1890 census, lived Jens Petersen Ostergaard, a farmer aged 59; his wife, Ane Marie Sorensdatter, aged 57; a daughter, Sidsel Jensine Ostergaard, aged 14; and a foster child, Karen Hansine Hansen, aged 4. The info. that you gave, and this census report are very much alike. You might find more info. on the Danish Demographic Database. That is how I found some of my ancestors.