It is mo shinn-seanair.
Seanair
Seanair is pronouced- 'shen er'-means grandfather in scottish gaelic
Seanmhair - almost like "shen-he-vuhr" if that makes sense, you will be able to listen to it on one of the BBC's Gaelic sites "Beag air Bheag" or "Colin and Cumberland" < two different sites.
Seanair (pronounced 'Shen-ar')
There isn't really a Gaelic word for Uncle or Auntie, but the closest you will get is "Uncail", or if you want to go literal, "Brathair mo athair" which is just brother of my father. Just correcting the answer because it's very annoying when people get Scots and Scottish Gaelic mixed up!
In Irish: sinseanathair; in Scottish Gaelic: sin-seanair.
seanair
Scottish Gaelic for 'Grandmother' is 'Seanmhair'.
In Irish it's,Mamó (nana)Daideo (grandpa)
daideo ('daddo')
Irish Gaelic:seanmháthair/ máthair mhór, grandmotherseanathair/athair mór, grandfatherScottish Gaelic:seanmhair, grandmotherseanair, grandfather
piuthar-seanmhar (sister of grandmother) piuthar-seanar (sister of grandfather)