Recently we have had a neighborhood cat adopt us. She stayed on our back porch all winter and lo and behold she had kittens in the bed we made for her back there! :) However about 2 weeks after she had them, she moved them off the back porch. :( Now we cannot find them. Today we heard them and it sounded like they were in the heating vents of the house. We went down to the basement of our house and found one lone kitten. Now we have NO idea where she came from or where the other kittens are. They are only about four weeks old and I am wondering how to care for this one until we can find the other ones and momma cat. Any suggestions?