I have a similar, but different situation. How do I update a marriage to reflect relationship to an existing member's record? The only option I see in LCR is to create a new membership record. Or, dissolve the marriage. I want to update the wife's marriage to reflect that her husband is a member - and tie her to the other member of her household.
A couple recently moved into our ward, and we received their membership records. Unfortunately the records came in as unrelated. The wife is a recent convert. Whenever her data was entered initially, her husband was listed as a non-member. But he is not a non-member. We have his records as well. He was showing as unmarried. Each spouse was head of their own household. I put them into the same household, and added the marriage date/place, etc. to the husband's record. Looking at the husband's record - the household now appears setup correctly. I can view family - and see both husband and wife. On the household view I see 'wife' as relationship to the female in the house. However, when viewing household from the wife's record, while it shows her as having a spouse of the same name as the male in the household there is a notation of "(non-member)" next to the spouses name - and gives an option to create a record for the spouse. Still from the wife's record, in the household view, the wife's relation to the male in the household is 'other'.