How can you tell when someone isn't being genuine?

I sometimes (well most of the time if truth be known) think it's small talk and someone asking that (depending if you class the person as close to your family) would not really care how your family is.....if you see what I mean. It's often just small talk to get a conversation going that way. 

If you went into real detail about how your family is really and told them any troubles your family was having would they "really" be interested or try to get away asap. I can't help but think like this. It can also often be just a way for someone to ask for something from you too because it starts a conversation off whereby they want you to "think" they actually care. 

Just my warped mind I guess!!???

I sometimes (well most of the time if truth be known) think it's small talk and someone asking that (depending if you class the person as close to your family) would not really care how your family is.....if you see what I mean. It's often just small talk to get a conversation going that way. 

If you went into real detail about how your family is really and told them any troubles your family was having would they "really" be interested or try to get away asap. I can't help but think like this. It can also often be just a way for someone to ask for something from you too because it starts a conversation off whereby they want you to "think" they actually care. 

Just my warped mind I guess!!???