McGilp/McKillop family

[Shona]

I'm helping a descendant of my great-great grandfather, John McLean, with some FH questions.

She is trying to find out what happened to her 4th great grandparents John McGilp and Cathrine McMillan who married 1811 in South Knapdale, Argyllshire.

McKillop is a variant of McGilp.

Six daughters and a possible son were baptised in Ballimenach/Ballemonoch, South Knapdale, Argyll.

John McGilp and Catherine McMillan's children:

1816 Cathrine (father, crofter)
1818 Christian (father, crofter)
1820 Betty (father, crofter)
1823 Isabella (father, weaver)
1825 Marron (father weaver)
1827 Margaret (father weaver)
1831 John (father, weaver, but mother listed as Mary McMillan - second wife or error?)

Scotland's Places state that 'Balamenach' was in ruins in 1868.

The family seem to vanish, except for Isabella who married a fisherman named Duncan Campbell in January 1851.

On census records (she is in Tarbert in 1861 and after that in Campbeltown) Isabella says she is born in Tarbert, which is split between the parish of South Knapdale and Kicalmonell.

The parents are named on Isabella's death registration in 1903 as John McGilp, fisherman (dec) and Catherine McMillan (dec).

Can anyone find out what happened to John, Catherine and Isabella's siblings, please?

I have found a John McGilp in 1861 and 1871, which I will post details of, but I don't know if it's the right one.

Many families emigrated from this part of Argyll, mainly to Canada.