Whenever it is found that any child is not properly treated in any foster family or that any such foster family is not a suitable one and is of such character as to jeopardize the welfare of any child so placed therein, the Commissioner of Children and Families, upon being satisfied of the ill treatment of the child or the unsuitableness of the foster family, shall remove the child from such foster family and take such further action as is necessary to secure the welfare of the child.