John Michael Collins was a son of James B Collins and Mary O'Brien.
Kathleen L O'Brien was a daughter of Patrick J O'Brien and Margaret Sullivan.

John Michael Collins and Kathleen Loretta O'Brien married on Saturday, 2 August 1919 at Brooklyn, Kings, New York.  The report of the wedding was recorded on page 5 of The Brooklyn Daily Eagle on Tuesday 5 August 1919. Hereunder transcribed.

COLLINS O'BRIEN,
Miss Kathleen Loretta O'Brien of 611 Monroe st, was the bride of John Collins of Milton, N. Y., Saturday. The ceremony was performed at a nuptial mass at St. John's Church, the Rev. Father Moore officiating. Mrs. John Cahill, a sister of the bride, was matron of honor; Miss Dorothy O'Brien and Miss Regina Sullivan attending the bride as flower girls. The bride wore a wedding gown of white and carried a bouquet of sweet peas. George W. O'Brien was Mr. Collins' best man.
Those present were: Mrs. P. Duffy of Yonkers, N. Y., Mr. and Mrs. W. H. Dooley, Mr. and Mrs. J. J. O'Connell, Mr. and Mrs. J. A. O'Sullivan, Mr. and Mrs. William Sullivan, John Cahill, Mr. and Mrs. Lawrence P. O'Brien, George W. O'Brien, Frank P. O'Brien, T. O'Brien of Milton, N. Y., Miss May Cahill, Mr. and Mrs. Monteith, Mr. and Mrs. J. Grogan, Miss Marguerite Moore, Alonzo Sullivan, Miss E. Kelly. Miss Genevieve O'Brien, the bride's sister in Stamford, N. Y., was unable to attend.

Children:

Eileen Mary Collins

Margaret Mary Collins

Census 1920:

Census 1930:

Census 1940:

Census 1950:

Death record of John M Collins

Burial
Calvary Cemetery, Woodside, Queens County, New York