How old is too old for tall tales?

[Cornishbelle]

Dc in year 2, has a classmate who regularly tells fibs as if they are reality. Eg has a baby sister, grandfather was killed in the war (both still alive), has an older brother who lives abroad, grandparents live on a farm, etc etc.

She's 7 and a half is this still classed as vivd imagination? I don't see the harm but her Dad is worried and sees this as lying that could get her into trouble and could potentially be a sign of ASD.

Some children struggle with the difference between fantasy/ reality and may need some sort of intervention if it continues.
The danger of telling lies/ tall tales is that the child may not be believed when it matters. There is the other obvious difficulty of the child accusing peers or others of doing something they haven’t.
Id be looking for some modern day Peter and the wolf type tales or moral tales about lying.
Not enough on its own to indicate autism though.
Some ND children are exceptionally truthful.

She’s 7! Surely she’s just a child having a vivid imagination?

Presumably you wouldn’t think anything unusual of she excitedly talked about Santa Claus, the Tooth Fairy and the Easter bunny?

Yes I completely understand about vivid imagination and I think it's cute tbh, but her Dad has been explaining to me and a few other parents at drop off that he's concerned and feels like he has to explain these things away eg teaching assistant congratulated him on new baby when there wasn't one, teacher tried to chat about a holiday destination they had both been to but the family actually hadn't as the daughter had made it up

I said sure she'll grow out of it but he's worried as when questioned she doesn't seen to see it is imagination and acts "faux confused " as he puts it.