 Margaret O Keefe, Cliff s mail carrier girlfriend living in Canada, has come back to Boston wanting to rekindle her relationship with Cliff. Cliff also wants to do so, but he isn t thinking marriage just yet. The biggest hurdle in the relationship is that Ma Clavin and Margaret have never met. When Cliff tells Ma about Margaret, Ma is hurt - she feels like Cliff wants to replace her with another woman. But Ma and Margaret do meet, and after an initial coolness between them, Ma and Margaret get along famously. They get along so well that Ma proposes to Margaret for Cliff and Margaret accepts, without Cliff even being there. Ma and Margaret announce this news to the gang at the bar. Ma is dictating the details of the wedding. Although Cliff loves both Ma and Margaret, Cliff decides that he s not ready for marriage but can t stand up to Ma. Frasier convinces Cliff to stand up for what he wants in life. Cliff manages to tell Margaret, but he has more difficulty telling Ma. Although he finally does tell Ma to which she has to accept, Ma ultimately has to do Cliff s work in his relationship with Margaret. Meanwhile, Rebecca and Sam are still trying to have a baby. It s been two months without success. Rebecca is being scientific about it, and thinks the problem is that Sam is too warm "down there" due to the fact that he wears constricting bikini briefs. She suggests he try boxer shorts that contain freon to freeze his testicles. Sam doesn t like them as their coldness is causing him to become a little testy.