I read this on www.everydayhealth.com I know what you are going through, because my 7yr old lost his father when he was 3yrs old, and even 4 years later he still says stuff about him. I don't know if the article will help but it's a place to start. I will keep you in my prayers because I also know how hard it is to be a single parent.
Everyday Tips
After a Trauma: Help for Kids at Any Age
Kids coping with a traumatic event will need your help in healing no matter how old they are.
After being exposed to a disaster or traumatic event, children are likely to show signs of stress. The signs can include sadness and anxiety, outbursts and tantrums, aggressive behavior, a return to earlier behavior that was outgrown, stomachaches and headaches, and an ongoing desire to stay home from school or away from friends. These reactions are normal and usually do not last long. Whether your child is a preschooler, adolescent, or somewhere in between, you can help your child by following the suggestions below:
Preschooler
Stick to regular family routines as much as possible.
Make an extra effort to provide comfort and reassurance.
Avoid unnecessary separations.
Permit a child to sleep in the parents' room temporarily.
Encourage expression of feelings and emotions through play, drawing, puppet shows, and story telling.
Limit media exposure.
Develop a safety plan for future incidents.
Elementary Age Children
Provide extra attention and consideration.
Set gentle but firm limits for acting out behavior.
Listen to a child's repeated telling of his/her trauma experience.
Encourage expression of thoughts and feelings through conversation and play.
Provide home chores and rehabilitation activities that are structured, but not too demanding.
Rehearse safety measures for future incidents.
Point out kind deeds and the ways in which people helped each other during the disaster or traumatic event.
Pre-adolescents and Adolescents
Provide extra attention and consideration.
Be there to listen to your children, but don't force them to talk about feelings and emotions.
Encourage discussion of trauma experiences among peers.
Promote involvement with community recovery work.
Urge participation in physical activities.
Encourage resumption of regular social and recreational activities.
Rehearse family safety measures for future incidents.
It is important to remember that you do not have to "fix" how your child feels. Instead, focus on helping your child understand and deal with his or her experiences. Healing is an evolving state for most children, but some may need professional help.
If signs of stress do not subside after a few weeks, or if they get worse, consider consulting a mental health professional who has special training in working with children. In time and with help, your children will learn that life does go on.