I may be missing a generation here. Mary might have been married to a different Wisniewski than to whom I have her assigned. The reason I write that, is that the obituary I found online (undated) mentions that this Wisniewski was a nephew of Basil Trzeciak and Christine Kawinski. That seems to suggest that he would have to have been Mary's SON rather than her husband. See below:

Name: Wisniewski, ?
Date: ?
Source: Cleveland Press; Cleveland Necrology File, Reel #087.
Notes: ? ?cerzak), father of Florence, ? Lieut, Leonard and Rita May, grandfather of Joann and Orijann, nephew of Basil Trzeciak and Christine Kawinski. Funeral Thursday, Sept. 2, from Golubski and Sons Funeral Home, corner E. 65 and Fullerton ave., 9 a. m. Services at Immaculate Heart of Mary Church. 9:30 a. m.
There is a Mary TRZECIOK married to a Herman Obst.

1. 2. Rita Mae WISNIEWSKI  
2. 3. Florence WISNIEWSKI  
3. 4. Leonard WISNIEWSKI   d. May 1970, Seven Hills, Cuyahoga, Ohio, USA.

OBIT: Name: Wisniewski, Leonard J.
Date: May 1 1970
Source: Cleveland Press; Cleveland Necrology File, Reel #167.
Notes: Wisniewski. Leonard J. Wisniewski of Seven Hills, beloved husband of Stephany (nee Krawczyk), dear father of Leonard D. and Robert A., dear son of Mary and the late Stanley, brother of Florence Sliwinski and Rita Glinski. Funeral Saturday, May 2, at St. Columbkille Church, at 9 a.m. Interment Calvary Cemetery. Friends may call at The Holowchak Funeral Home, 5548 State Rd., 2-5 And 7-10 P.M. Friday

1. 5. Leonard A. WISNIEWSKI  
2. 6. Robert D. WISNIEWSKI