Dear All,
I believe such issues can be resolved with utmost care. Please consider the following points with this regard:
Firstly, check out their individual performance. In case their performance is falling or they are not achieving their targets, probably then you can put this point to their boss/super boss (Team Leader). Make sure such a thing should come from their boss via mail so as to have record thereof.
Have a feedback session with such employees. Act as a mentor and counsellor for them by bringing their achievements so far and the areas where they need to improve. Also, try to develop team spirit in the feedback.Ask them as to why they are not interacting and coordinating with their male team members in case of female employees.In case they speak out about their personal relationship,try to give some practical examples of such cases and the consequenses thereof.
Secondly, the company can probably specify the break timings, say, 2-3 tea breaks in a day of not more than 15 minutes in a day so as to avoid frequent meetings with their partners.
Thirdly, the boss should arrange a project wherein the female employee needs to interact and coordinate along with male employees for her project so that her partner should not feel possessive on account of that. Same procedure should be followed for male employees.
Also, i agree with Deepak that one cannot fire at the first instance to any employee on account of having relationship within the organisation.
But what if the performance of such employees is substantial enough? Then probably you can have feedback session exclusive of the point realting to their performance as mentioned above.
Please correct me in case i am wrong.