One purported wife is "Elizabeth Grosse", supposedly a cousin (no detailed tree and NO documentation).
The other is the relatively well documented "Widow Grosse" who later married Major John Welsh.
One of the variant spellings of his surname (Grosse, Groce, Grose) suggests possible Lowland Scots ancestry (cf. Robert Burns, "Ken ye aught of Captain Grose?")
Update: Burns actually wrote those lines to/about Captain Francis Grose, an antiquary (historian) of Swiss extraction, who is best known today for his 1811 "Dictionary of the Vulgar Tongue".
At the time Grose was wandering around Scotland, taking notes as he went, and one of Burns' verses inquired, tongue in cheek, whether he had fallen foul of the Sawney Beans. https://en.wikipedia.org/wiki/Sawney_Bean
Well, anyway, here's the poem:
Ken ye ought o' Captain Grose?
Igo and ago
If he's among his friends or foes?
Iram, coram, dago
Is he south, or is he north?
Igo and ago
Or drowned in the River Forth?
Iram, coram, dago
2.
Is he slain by Hielan' bodies?
Igo and ago
And eaten like a wether haggis?
Iram, coram, dago
Is he to Abra'm's bosom gane?
Igo and ago
Or haudin Sarah by the wame?
Iram, coram, dago
3.
Where'er he be, the Lord be near him!
Igo and ago
As for the Deil, he daur na steer him.
Iram, coram, dago
But please transmit th' enclosed letter
Igo and ago
Which will oblige your humble debtor
Iram, coram, dago
4.
So may ye hae auld stanes in store,
Igo and ago
The very stanes that Adam bore!
Iram, coram, dago
So may ye get in glad possession,
Igo and ago
The coins o' Satan's coronation!
Iram, coram, dago