templates/qommon/forms/widgets/reservations-enfant.html

@@ -37,7 +37,10 @@
                         <div class="activity-label"/>
                         <label>
                           <input
+                            {# never displayed, no possible changes to not overwrite #}
                             {% if not widget.value and option.options.prefill %}checked="checked"{% endif %}
+                            {# already displayed but for another child #}
+                            {% if widget.value and widget.value|first|split:':'|first != last_option.value|split:':'|first and option.options.prefill %}checked="checked"{% endif %}
                             {% if option.selected %}checked="checked"
                             {% elif widget.readonly or option.disabled %}disabled{% endif %}
                             {% for attr in widget.attrs.items %}{{attr.0}}="{{attr.1}}"{% endfor %}