Hi Louise
A point to remember when searching on IGI is that extracts of births/marriages stop for Scotland around 1874/5. After this point your only source will be Scotlands People. Censuses can also help out to fill out the births along to the way (although naturally won't show any early deaths):
Father: Kenneth Macleod, Mother: Margaret Macleay
1. CATHERINE MCLEOD Birth: 01 FEB 1874 Barvas, Ross And Cromarty, Scotland
2. DONALD MACLEOD Birth: 22 NOV 1871 Barvas, Ross And Cromarty, Scotland
Father: Angus MacLeod Mother: Catherine MacDonald
Best fit for a marriage, a submitted entry:
ANGUS MAC LEOD Marriages: Spouse: CATHERINE MC DONALD
Marriage: 13 NOV 1822 Stornoway, Ross And Cromarty, Scotland
and children showing:
1. MURDO MAC LEOD Birth: APR 1843/ Christening: 27 MAY 1844 Stornoway, Ross And Cromarty, Scotland
2. JOHN MAC LEOD Birth: JAN 1839/ Christening: 27 MAY 1844 Stornoway, Ross And Cromarty, Scotland
3. MARGARET MAC LEOD Birth: APR 1840/ Christening: 03 APR 1843 Stornoway, Ross And Cromarty, Scotland
4. DONALD MAC LEOD Birth: 01 APR 1831/ Christening: 13 JUN 1831 Stornoway, Ross And Cromarty, Scotland
5. KENNETH MAC LEOD Birth: AUG 1837/ Christening: 27 MAY 1844 Stornoway, Ross And Cromarty, Scotland
6. MARY MAC LEOD Birth: 22 SEP 1835/ Christening: 20 MAR 1836 Stornoway, Ross And Cromarty, Scotland
A big health warning on the pre-1855 entries for Kenneth and siblings. Given how common the names are in the area, the entries I have listed below may belong to more than one couple. Also there are a number of submitted entries as well as actual extracts (with varying dates). With this is mind, the best route would be to verify the family (children) through the censuses (1841-61).
Regards.
Monica
PS: I'm out this PM, I'll have a go on the other lines for you tomorrow if somebody else doesn't in the meantime!