From the question, I am assuming that your nieces are your brother's daughters, that their Mom got custody and that she has sole custody with parenting time to your brother every other weekend. If this is the case, your brother needs to contact the local office of the Oregon Department of Human Services (DHS) and explain what is happening. Hopefully, the agency will go the mother's home and do a welfare check on the girls. If they see that they are not being cared for properly, they can take the girls from the mother and give them to your brother who can then file a motion to modify custody with the court that has jurisdiction. Best case, go see a local family law attorney.
Answered on Sep 11th, 2013 at 8:42 PM