Arthur served in the Canadian Army in WWI. Regimental #645819.
Dean was born after his parents had legally changed their surnames, so he was born as a "Richardsen" and did not go through the name change procedure his siblings did.
The LDS records for Mary's marriage and two known children spell the surname as "Hardin".
Three of Sarah's seven children died at an early age -- reasons unknown.
Marriage record LDS: M113866