app/views/comments/_form.html.erb
<%= simple_form_for([@family, @family.comments.build]) do |f| %>
<ul class="list-group">
<li class="list-group-item">
<%= f.input :content, label: "Comment" %>
<%= f.label :confidential, "Confidential" %>
<%= f.check_box :confidential, label: "Confidential" %>
</li>
</ul>
<div class = "buttonControl">
<%= f.button :submit %>
</div>
<% end %>