A cow can be shared by seven people for seven families! It can be shared by less then seven and it can be shared by even numbers.

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This is permissible but the sunnah is to include the dead in your own sacrifice.

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This is permissible. However, the sunnah is to slaughter only one sheep and include in it all your deceased ones.

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The sacrifice can be one sheep or goat for the whole of the household living under one roof and eating from the same kitchen. One can also include the deceased of his family in it. However, it is an innovation to include the Prophet salla allahu alaihi wa sallam in it.

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