I didn't think about the headstone thing. I guess I'll just have to get them one!
Diane, you may not be allowed to put one there,it depends on the policy of the cemetery.
My grandad has a WW2 war grave,my grandma and uncle were later buried in the same grave.
The family never got round to putting a headstone for them,and they weren't allowed to 'deface' the army one. A couple of years ago my cousin and I decided to see if we could add a small stone.
The first question the council asked was " who owns the grave"...luckily my cousins does,being the only child of my uncle,who was the oldest child of my grandparents.
So we were allowed to add an open book stone with both names on it.
My mum would have been pleased to know that we finally got that done.
You have plenty of time to sort it all out before next spring though

Carol