1. Can One Animal Be Shared?
There are many opinions and scattered rules pertaining to this issue so I will summarize and try to be as clear and concise as possible. Let us begin with what is agreed upon (i.e. there is no debate concerning it). If each member of a household were to offer a sacrifice on his/her own behalf there is no difference of opinion that each one receives the reward for his/her sacrifice Inshaa Allaah. This is the case for one who offers a goat, lamb or a share (1/7) in a camel or a cow. So in this case, each individual purchases an animal or a share (1/7) in an animal (cow or camel) on his/her own.
The next issue is whether or not a man can include his entire household in his intention (for earning reward of the sacrifice), whether he is slaughtering a goat, sheep (lamb) or he takes a share in a cow or camel. The Hanafee scholars do not see this as being valid; however, the majority of scholars do. It would appear from the evidence found in the sunnah that the opinion of the majority is most correct Inshaa Allaah.