William Innes of Oust

I believe that this has to do with Innes of Thursater but some of the Innesses came from Sanside. Fiona Sinclair has mentioned that there is a Sandside just adacent to Oust which is in Thursater.

There were apparently two families of Inneses of Oust, as we find in 1671 Elspeth Innes, relict of William Innes of Oust, her eldest son.
In their book CAITHNESS FAMILY HISTORY John Henderson and Fiona Sinclair have stated the above.
I have hit a brick wall.
Does anyone happen to know besides William Innes, being the eldest son of William Innes, who the other children were.
I do know that the word RELICT means Widow or widower.

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William in Montreal