one of my friends has been in your position. she played it like this. all the colleagues helped in keeping the cat with them for a 3-5 days period cause the 'owner' was out of town. from time to time the cat went back to her. 3 rotations later the parents started to miss the cat and ask about the cat. by the 5th rotation she told them the truth and was allowed to keep it. your case is more complicated cause it involves baby cats... I wish you luck.