I have a litter of five kittens who turned six weeks on Sunday. The "middle child" (only one who's birth order I know for sure) is a little tom who will be going to a large family in a few weeks - but he is always so fearful whenever people come round! He retreats to a place where he can see what's going on, but hisses when strangers (to him) approach. How can I help him be more sociable and less fearful? His new family will have five children aged between 7 and 17, plus an older cat (and large home, large garden). What tips can I give them if he's still overly timid?