This response will initially give a glimpse of hope to the expectant family members. In addition, it is likely to elicit laughter from them when the statement is completed. When this is the case, they might wander off from the topic and completely forget about it.
This prevents unending questions about your relationship status. With this response, there is even room to get more innovative. “In essence, I prefer the present to the future. With the future, you are not too sure of what can happen.”