While you might feel it will be helpful to hide your grief to protect your child, a lot of people have found that being honest about their sorrow is better. It helps their children see that grieving is natural, normal, and healing.
Try not to avoid talking about the deceased loved one because your child may feel that you are keeping secrets or that you are trying to erase the memories of the person. In truth, being able to talk about the deceased person, especially the positive qualities of the person, may make way for faster healing.
Understandably, there are a lot of things that should be done at this point in your life, and yes, you might sometimes feel consumed by your pain, but do not forget that your children need you at this time just as much as you need them.