That Time of The Month: Births and Deaths (Part 1)

Check out these strange recurring numbers. See how many times the numbers 10, 20, 15, 16, and 28 appear, not only with these three generations, but even within the generation marked "Children".

Grandparents (Mother):
Josef Kacsur b. 21 August 1855 d. 20 August 1906
Johanna Burcsak b. 30 July 1856 d. Unk.


Grandparents (Father):
Jan Hlafka b. 25 May 1845 d. 17 July 1878
Anna Maria Matz b. 20 October 1858 d. Unk.


Parents:
John Gabriel Hlafka (Holt) b. 24 March 1877 d. 16 November 1937
Maria Kacsur: b. 29 May 1879 d. Unk. (Between 1904-08) [1st Wife]

Children:
Frank Philip Holt: b. 2 April 1903 d. 15 December 1988
John G. Holt Jr. b. 10 July 1904 d. 28 March 1963

Parents:
Bertha Teresa Kacsur: b. 10 June 1888 d. 23 June 1946 [2nd Wife]

Children:
Bertha Teresa Holt b. 16 March 1909 d. 26 December 1998
Mary Elizabeth Holt b. 16 February 1911 d. 28 August 1999
Joseph Frederick Holt b. 15 September 1913 d. 15 February 1975
William Robert Holt b. 3 January 1917 d. 20 October 2008 **
Albin Holt b. 23 February 1919 d. 28 September 1919
(Male Still born) Holt b. 20 March 1925 d. 20 March 1925


** Father's grandmother: b. 3 January 1819 d. 3 January 1855

Kind of weird, isn't it? This weirdness goes back even farther.