I am trying to find the parents of one of my ancestors, Mary Monson, could someone help me?
Very doubtful you'll get much help when providing such vague information. If you've found Mary Monson, at the very least you must have a country of birth (hopefully, a general area within it, too) and a rough time-period: even a century would help.
I'm sure a number of "Community" participants would be only too willing to provide advice, but please provide a little more detail about Mary Monson first.
However, if you go to the page at https://www.familysearch.org/search/tree/results?q.givenName=mary&q.givenName.exact=on&q.surname=monson&q.surname.exact=on you will find a number of individuals of that name included in Family Tree (some with parents added, too). Perhaps one of these might be "your" Mary?
Ok thanks ☺️