श्वशुरघर (Sanskrit) comes from Sanskrit घर, from Sanskrit गृह, from Proto-Indo-Iranian gʰr̥dʰás, from Proto-Indo-European gʰr̥dʰós, from Proto-Indo-European gʰerdʰ- — to enclose, to encircle; enclosure, fence, belt.
Ancestry of “श्वशुरघर”, step by step
श्वशुरघर traces back through two separate lines of ancestry.