Dear Soon-to-be-Mother-in-Law,
What a wonderful, sensitive question. Many parents would be nervous or uncomfortable about their daughter's impending marriage in a setting very different from what they are used to and here you are, wondering respectfully how you can be there for your daughter's intended. I hope your daughter and her fiance both realize how lucky they are to have you in their lives.
There are few formal ritual roles for the mother of the groom at a traditional Jewish wedding, but much of this will depend on what kind of relationship you already have with your son in law. Since the parents of the couple often stand beneath the huppah, will he have someone standing in for his parents? If not, perhaps the mesader kiddushin (the rabbi performing the service) can make it explicit that you are there on behalf of both members of the couple? Often both parents walk each of the people being married down the aisle to the huppah. If he has no one to walk him, perhaps you could volunteer, especially if your daughter's father is available to walk her? At some weddings, there is a point before the huppah where both sets of parents offer blessings--either quietly or out loud-- to their respective children. Perhaps he would be comfortable having you offer him some blessing for his future life with your daughter?
Ultimately, this all depends on what your son in law will find comfortable and meaningful, so you should approach this gently and ask him whether he would want any of these things. He may not, and if he does not it may have nothing at all to do with his feelings of warmth and respect towards you, so you should not take it personally. Getting married without your parents in attendance is bound to bring up difficult memories or feelings of loss, and it is important not to impose if he feels any reticence in having you fill that space. Nevertheless, you should certainly ask, and I hope that he will feel touched by the offer. Ultimately if he wants you to play such a role it is also important to have a conversation in advance with the rabbi performing the ceremony to make sure that he also is comfortable with the preceedings, and this may vary.
Whatever you and your son in law and the rabbi ultimately decide, may you and they know only happiness, good health and long life. I found your question itself extremely touching.
best wishes,
Don Seeman
Answered by: Rabbi Don Seeman