Always pay close attention to the person who was appointed to be the administrator of the estate of a man who died with a wife and young children. If the person is not clearly a relative of the deceased individual, it very likely is a biological relative of the wife–or perhaps her second husband.
And if there is a will and the wife is appointed executor, look carefully at who signed her bond. Those bondsmen were often relatives of the widow.
Try a Genealogy Search on GenealogyBank.