Hi Elizabeth
Are you sure of the parents?
Ive found them on the 1901 with mother Marg(aret):
West Helmsdale, Kildonan
RD 52 ED 2 Page 8
Marg McIntosh, 45, Crofter's wife
Alexina, 11
Adam, 9
Minnie, 5
John H, 3
Alice, 9 months
Mary McDonald, relative, 70, annuitant
all b. Kildonan
Alice's birth reg has her parents as John McDonald McIntosh, a journeyman cooper and Margaret m.s. McLeod. They married 28th Sept 1894, Kildonan, according to the birth cert.
Have you checked the Scotland's People site for possible marriages of the children? None in Sutherland but a number showing for other parts of Scotland 1906-1932.
Regards
Gadget