As there are quite a few of these now, I thought an index putting them in chronological order might be helpful.
Christmas Surprise2013: It's Christmas, Gus is 13 and his old room in his Dad's house is getting too small for him. To make it worse, there's a baby in the house.
Trick or Treat2016: Gus is 16, it's Halloween and he wants to go out with his mates. But 3 year old Dani really really wants to go Trick or Treating with her big brother.
Leaving Home2017: Gus is 17 going on 18 when Brian suffers a case of deja-vu; another woman visits his office and dumps a bag of clothes on his desk.
Changing Roles2017: Follows directly on from Leaving Home. Brian finds himself hosting a family dinner. This was actually the fic that introduced Dani.
Christmas Memories: 20292029: Gus is 29, Dani is 16. The immediate family is gathered for Christmas Eve, and the two 'kids' start reminiscing about past Christmases with their fathers.
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