You might be lucky and get Rebecca's marriage sooner rather than later but I would expect it to take anywhere between 2-3 weeks before it reaches you. You might get a nice surprise if it arrives early then!
Re Jessie's siblings, we did have one family tree on a/try that we mentioned earlier. This showed eldest Agnes Naismith Burnett marrying a Joseph McLean in 1908 in Bellshill. The tree owner is from this family of Agnes and is not complete in respect of Agnes' siblings. But, nice to know what happened with Agnes, the eldest. Also a little on the ancestry of father Robert, his parents and siblings etc. Best way to confirm this would be to look for Jessie's parents' marriage or their deaths. Both would include parent/s details to let you work back with confidence.
There is a lot of ancestry to gather here really Mel. We have only just found them
You probably need to decide how you want to proceed from here and maybe concentrate on main lines first. Even then, you need to decide whether to start with Samuel first or Jessie.
Marg, I know why you are thinking about seeing Jessie pop up on one of her two younger sisters' marriage certs...specially if it was after 1932 as we saw Jessie as Jessie Alexander...
Jessie could also have reported one of her parents' deaths too. The problem with all of this, as we all know, is you don't know what you will find until you look.
Mel, the only place to look for this BMD information will be on the pay to view site, Scotlands People (SP). You can look at these records personally at one of the main genealogy centres in Scotland but that is not open to you now so you are looking at using the pay to view site SP...becomes addictive
Monica