People losing someone to suicide can experience very complicated grief. It is important to discuss how you are feeling openly and honestly to process and deal with this grief.
This resource from Lifeline provides some tips:
Take time out for yourself.
Stay connected and accept support.
Honour the deceased person.
Stay healthy.
Prioritise daily tasks.
Ask for help.
Join a suicide bereavement support group.
There is also guidance on what you can do to help someone bereaved by suicide, including children.