Hi there and thanks for reply.
I had the census info already, thanks.Have now tried the links you supplied below but to no avail.
It seems they only existed on census.
No record on SSDI for any of them. Nor marriages for Wilfred and Frances(they may well have never married!!!).Only the marriage of Frederick and Mary Gertrude in Detroit,Mayne,Michigan in 1911
Now not sure where to look next?!