They are wild. Don't forget that. They might attack you or your family members.
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No. You can only tame a wolf with bones.
No.
No, you currently can not tame cows. But it is possible to farm them, put them in an area they can't escape from (not necessarily needed) and right click on two of them with wheat and they will breed. You can also right click on them with a bucket to fill it up with milk. The only animals you can tame on Minecraft is the wolf (Feed the bones to the wolf until it has a red collar and a burst of hearts come out). I think you can be able to tame a cow in a newer version of Minecraft. You can also tame ocelots as of 12w04a using raw fish
You can not tame a villager in Minecraft. They can not be used as a pet such as wolfs and ocolots.
No, you can't. If you hit the wolf it will become angry and it will keep attacking you until it is dead.