The dates would allow for Samuel C Allday to have had a son by 1850 but there is no trace so far of him being married prior to his arrival in Australia in 1851. The different spelling of Allday/Alday could be an error but I doubt that the relationship could be through that source. If there is a relationship it could have been created by a brother of Sam. I haven't yet established whether there were any siblings but it is probable. I will investigate further.