Q. Re- above question. It is still unclear to me which is the best way to follow. Should the mesader kiddushin drink from the wine cup or not?
A. As mentioned in the above answer, there are a number of minhagim.
1) The minhag of Sephardim is usually that the mesader drinks from the cup.
2) Askenazim follow three different traditions. The mesader does not drink; only the chosson and kalla do.
3) The mesader drinks or spills some on his hand and licks it.
4) The cup is given to a child. (not common, Tashbatz 3: 65).
Horav Shlomo Miller’s Shlit’a opinion is that the mesader kiddushin should follow his minhag.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a