Question

Looking for information on Merritt F. Ross and Mary F. Johnson.

Answer 1

Suggestion: include a LOCATION - Country>Province.County/State > City/town?

and  a timeframe - DATES  of birth/marriage/death -  1640's or 1980's!  

You might want to try familysearch.org and their free online search tool.  Found a marriage record and some children although I have no idea if it's the correct people w/o knowing if you are looking for someone in the US in the late 1800's!.

Example below:

https://familysearch.org/search/records/index#count=20&query=%2Bgivenname%3Amerrit~%20%2Bsurname%3Aross~%20%2Bbirth_place%3AUS~%20%2Bbirth_year%3A1870-1875~%20%2Bspouse_givenname%3Amary~%20%2Bspouse_surname%3Ajohnson~

Michigan, Marriages

Groom's Name:                              Merritt E. Ross

Groom's Birth Date:                       1873

Groom's Birthplace:                       Spencer, Ohio

Groom's Age:                                 28

Bride's Name:                                 Mary Johnson

Bride's Birth Date:                         1884

Bride's Birthplace:                          Flint, Mich.

Bride's Age:                                   17

Marriage Date:                               17 May 1901

Marriage Place:                               Flint, Genesee, Michigan

Groom's Father's Name:                 Jerry Ross

Groom's Mother's Name:               Sarah Cowen

Bride's Mother's Name:                  Conway Johnson

Groom's Race:                                White

Bride's Race:                                  White

Indexing Project (Batch) Number: M73663-7

System Origin:                               Michigan-EASy

Source Film Number:                     1018927

Reference Number:                        bk 1887-1890 v6pg339