What does the Bible say about children taking care of their elderly parents?

Help them. It is our job as not just Christians but as humans to help those around us. Jesus in The Bible gave the example of the Good Samaritan who, even though he was not friends with the man who had been injured, still stopped on the roadside to help him, give him aid and payed for him to stay at an inn. This is our example and we must do all that we can to help those in need.