Hi Marj
The names of the marriage witnesses will be on that (1890) printout you have. Most usually of course they were relatives of the bride and groom ... and it's always worthwhile "investigating" them further.
If you'd like to put the witnesses names here, we can do a check.
The death printouts of either parent, will only give you the age and sex of their "living issue" - as at the date they (parents) died.
School records may be available, that will turn up names of siblings. (Sorry, I don't have access to these, but someone else here, may be able to help you.)
~ Lu