Mr. Sands

Mr. Sands comes into possession of the children when Dr. Flint finally decided to sell the children to a slave trader. The slave trader, one of the few caring slave traders, than sold the children to Mr. Sands.
Linda trusts him because he is the father of her children. Considering Linda felt safe enough with Mr. Sands to have children, she is pretty trusting of him. I think that Mr. Sands is trustworthy because he took the time to buy the children from the slave trader. If he did not care about the children and Linda, he would not have even considered helping Linda and her family out by buying the children. Plus, Mr. Sands purchased the children for a great deal of money, which he would not have done if he were not trustworthy.