If you look at Lancashire BMD it shows Mary A Sutherland married Henry Forshaw at St Oswald , Collyhurst , Manchester 1861. There is also an application form you can download for the marriage certificate.

Henry is likely to be the son of Richard and Mary Forshaw from Manchester.

Then look at Brian Lawson,s death index for Foushaw, Laura may have died young since she is not with the family in 1881. Alexander seems to have died young, is your date of death a missprint?

Len Faragher