Need help finding particular dates on this McGarry family

I live in Toledo, Ohio. I need info. on an ancestor of mine named Elsie McGarry, She had a child named Carl Knowles, he was the youngest of 5 children. Elsie came from Ireland, she is my Great Great Grandmother, Carl is my Great Grandfather, his childs name was Linda Knowles and is my grandmother, she was born in 1947, so Elsies time of birth was probably around 1900 or less. Elsie herself married Leo Knowles(he may of come from England). This is some rough info., I hope it is enough to spur some comments, even if they are just remarks I would appreciate it!