All great ideas Marie

I seem to have spent the last few days saying HUGE thank yous to lots of people who have helped with this search.....and today is no different

Fellow RootsChatter Brian (yokerbrian) very kindly looked up at New Register House the 1920 birth entry we had found for a David Jackson and has confirmed the entry is the correct one

David was born on 28th APRIL 1920 at 8h. 30m PM at 11 School Lane, CARLUKE, parents Alexande and Jeanie.
The address of School Lane, Carluke corresponds with the address given on Alexader's WW1 service papers.
Brian also confirmed the later births of sons Walter and Hugh, who South Lanarkshire Bereavement Services confirmed as also having been buried in the family lair.
The 1968 death entry for an Alexander Jackson is also the correct one

Alexander died at Strathclyde Hospital, Motherwell. His usual residence was 55 Shieldhill Road, Carluke. His date of death was 2nd February 1968.
Great work Brian

Monica