No, though they might be cousins, and Wario and Waluigi might be brothers, but it is uncomfimed.
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No. Mario and Luigi are brothers, and Waluigi and Wario are brothers. Wario and Mario; and Luigi and Waluigi are no related in any way. they are only rivals.
There is no official answer, honestly. All we know is they are Mario and Luigi's "evil counterparts." well Mario and luigi are cousins and waluigi and luigi are brothers Mario and Luigi are brothers... and I highly doubt that Wario and Waluigi are cousins with Mario and Luigi.
Wario and Waluigi are brothers. They're the evil opposites of Mario and Luigi.
Luigi is Mario's brother. Waluigi is Wario's brother. They might all be brothers, though.
They don't have one. Like Mario and Luigi don't have one. I don't know what Wario and Waluigi's last names are, but I know that Mario and Luigi have last names: Mario Mario and Luigi Mario. That's why they're called Super Mario Brothers.