Some Laws of Mourning for a Grandfather When the Father Already Passed Away

Do any laws of mourning apply to a person whose father passed away a few years ago, and now his paternal grandfather has passed away, and several of his uncles are sitting shiva for his grandfather?

He does not observe any mourning customs at all, since the custom to observe mourning is only out of respect for his father or mother who are sitting shiva. Since his father already passed away, there is no reason to observe this mourning.

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