I had a look in the on-line Winnipeg public cemteries, no WELDON by that/those name(s).
Check out this though:http://web2.gov.mb.ca/cca/vital/http://web2.gov.mb.ca/cca/vital/ The Manitoba Vital Statistics are recently on line and I see your possible Andrew there perhaps (Died 1894?). 08/09/1894.Let me know if that is the fellow, I will get the obit if there is one.
I also found in the Manitoba Directory for 1878-1879 a John A. Weldon, huckster,who worked with a McBain at Weldon & McBain, City Market, (but it appears he is single perhaps as he is just boarding in the market but this could be your Andrew's son?).Caught my eye because I am working McBain surname also.
Wait out a week or two; may be able to find more.
I will e-mail you with a PDF of the entry I found in the Manitoba Directory