Write about a meeting between a parent and child who have been separated since the child's birth
How would such a meeting come about?
Has one known about the other for some time, following their life?
Is the reason for the separation to be mentioned?
You could do it as a play script without any explanation of the circumstances and allow these to emerge
You could do it as stream of consciousness as one or other contemplates the meeting
You could have one not realise who the other is until the end, or after the end.
The separation need not have been negative (illness, illegitimacy, desertion). The parent may have been saving the child in some away.
One or the other may be a ghost, spirit in a séance, dream.