Genealogy Chat

I have come accross the following from Antrim N Ireland which relates to my ancestors Isaac & Martha Robb. I noticed there are a number of other Robb's in particular Elizabeth. I was wondering how i could find out what relation if any, she was to Isaac.
Also Martha's maiden name was McComb & i wondered if she was related to the McCombs on this list.


Killead Parish - Grange of Carmavy Townland
> HUGH ENDWORTH, 60 (Husband) - FARMER - Infirmity - Autumn 1846
> JANE MILLAR, 59 (Wife) - NONE - Fever - Summer 1850
> ELIZABETH ROBB, 7 (Sister) - NONE - Burned by fire - Spring 1842
> ISAAC ROBB, 52 (Father) - FARMER - Fever - Spring 1849
> MARTHA ROBB, 50 (Mother) - NONE - Fever - Spring 1849
> ALEXANDER GARLAND, 65 (Husband) - STONE MASON - Consumption - Spring
> 1846
> ELIZABETH SEMPLE, 77 (Mother) - NONE - Old Age - Spring 1845
> JANE SEMPLE, 42 (Sister) - NONE - Inflamation - Spring 1846
> ANN WHITESIDE, 74 (Mother) - NONE - Infirm - Winter 1846
> JOHN ROBB, 59 (Brother) - COOPER - Decline - Summer 1845
> AGNES WHITESIDE, 29 (Daughter) - MUSLIN SEWER - Decline {Summer 1846}
> MARTHA WHITESIDE, 30 (Daughter) - NONE - Decline - Winter 1851
> ANN BOYD, 3 (Grandchild) - NONE - Decline - Autumn 1846
> MARTHA CRAIG, 70 (Mother) - SPINSTER - Paraliss - Summer 1848
> JANE HARPER, 51 (Mother) - SPINSTER - Inflamation - Spring 1845
> JANE McLORIAN, 75 (Sister) - SPINSTER - Dropsy - Winter 1847
> GEORGE GOURLEY, 38 (Father) - LINEN WEAVER - Dropsy - Summer 1841
> FRANCIS McCOMB, 72 (Husband) - FARMER - Decline - Winter 1851
> JACOB GREEN, 52 (Husband) - FARMER - Disease in Head - Summer 1847
> SARAH GREEN, 9 (Daughter) - NONE - Water on Brain - Summer 1848
> JACOB GREEN, 6 (Son) - NONE - Inflamation - Summer 1848
> JOHN GREEN, 2 (Son) - NONE - Not Known - Summer 1848
> JAMES McCOMB, 10 (Son) - AT MR. CRAIG'S SCHOOL - Febet (?) - Spring 1848

anyone?