The first Isabella Alice KELLY on the list of birth registrations I posted was buried in Michael aged 13 months on 30 June 1891. [BL's burial index.]

There was also a burial in Michael for William Kelly aged 70 on 23 May 1877.

I therefore looked for them in the 1871 census, and found an entry which looks like Thomas with his parents at Glenwillyn, Michael.
William Kelly aged 64, labourer & fisherman, wife Elizabeth 59, Thos son 14 scholar, and Rubina Jane Enos granddaur 5, all b.Michael (and a boarder Wm Cannell 45 labourer b.Michael).

This appears to confirm Thomas's birthdate as 1857 which is older than he gave at marriage and in censuses, possibly because his wife was younger.
The IGI has an extracted (from par reg) bapt for Thomas son of William Kelly & Elizabeth 26 Jan.1857 Kirk Michael.

This could be Elizabeth's burial:
KELLY, Elizabeth 78 Michael 9 Jul 1889

Are there MIs for this Glenwillyn, Michael, KELLY family please? As well as Eliz 1889, husband William (1877) and their son Thomas's child Alice Isabella (1891)? And possibly other Kellys from Glenwillyn?

Many thanks,
Sue