Kozar Family

I have been looking for information about my Great Grandfather and his siblings and I believe that I have finally found the names of his siblings and their birthdates.Though the siblings birthdates may be a day or 2 off.

My great grandfather is John Kozar born July 3, 1874.Death May 1932

His siblings:

Andreas (Andrew) born November 26, 1865
Joannes born June 24, 1868

Their parents are John & Catharina (Csech) Kozar.I am not 100% sure when these two were born or even when they passed away.

On the baptismal records, the last name is spelled Kozsar on the Baptismal Records.

I have an ok amount of informatin on my Great Grandfather (b. 1873), but could use information on his siblings.Like where they may have lived, passed away, married, etc.John settled down in Youngstown, OH.