very true, as long as your cat gets his food has some where nice and comfortable to curl up and have a sleep during the day and gets a bit of love and affection now and again he'll be more than happy.

Depends from person to person. Some asthmatics are allergic to cats and it can trigger an attack, others it makes no difference. However if cats are a trigger for your sisters they might not be able to visit you - just keeping the cat out of the room they are in doesn't protect them from the dander and hair the cats leave in their wake.