"Seall, dà phiuthar."
Translation:Look, two sisters.
That's correct.. however:
Dà (two) causes lenition and is singular
Gaelic used to maintain quite a distinct 'dual' form when referring to two things only. This has broken down in many ways, but it is still important to know that two things in Gaelic are not regarded as plural. Dà (two), like aon (one), causes lenition on the noun that follows:
dà + bàta = dà bhàta (two boats)
dà + piseag = dà phiseag (two kittens)
Trì is the magic number
Plurals begin with the number three in Gaelic:
trì = 3 | ceithir = 4 | còig = 5
trì bàtaichean - three boats
ceithir bàtaichean - four boats
còig piseagan - five kittens