In Rikki-Tikki-Tavi, why do Nag and Nagaina enter the house?

Nag enters the house to hide in the bathroom and lurk for the family members (Teddy, His parents) to kill them and later kill Rikki. Nagaina enters to seek revenge from Teddy's dad for bloodbath Nag, but she doesn't know that Rikki killed Nag while he slept.
I'm not sure but loved rikki tikki tavi

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