Girl adopted by Gaithersburg MD couple

Girl adopted from Costa Rica was sexually abused by her adoptive father, who had previously sexually abused 3 bio daughters. Mother was unaware of the abuse The girl was adopted along with her brother from Costa Rica in 1981 when she was 11 and he was 9. Both children had been sexually abused in their original family. Sexual abuse started immediately after the adoption. The family also had 3 foster daughters who did not report being abused.
Father was convicted in the adopted daughter's case and 2 of the 3 bio daughters' cases. The 3rd bio daughter refused to testify.