Looking for information on how and why all three (3) died on 4 May 1942, Cook, Illinois, USA.

All three were buried together in the Marysville Cemetery, Marysville, Marshall, Kansas, USA on 9 May 1942.

I believe that Dolly's 2nd great-grandfather is Mordecai Lester (1774-1853)

Thank you,
familytrace4fsk