That's funny Nicholas! A similar story:
When my son and his then fiancÚ were engaged they attended an extended family pot luck dinner of her family. My son's contribution to dinner was a large green salad that includes home made Italian dressing. It's an old family recipe and is pretty good.
One of my now daughter-in-laws uncles told my son that the salad was great and asked where he got the recipe. My son responded that it is an old family recipe. The uncle asked if he could have it. My son responded,"Check with me after the wedding."