Where does “सासू” come from?

सासू (Marathi) comes from Old Marathi ????, from Maharastri Prakrit ????, from Sanskrit श्वश्रू, from Proto-Indo-Aryan swaśrúH, from Proto-Indo-Iranian swaćrúH, from Proto-Indo-European sweḱrúh₂, from Proto-Indo-European swéḱuros — father-in-law.

सासू (Marathi): mother-in-law

Definitions

mother-in-law

Ancestry of “सासू”, step by step

Step	Language	Word	Meaning
1	Old Marathi	????	—
2	Maharastri Prakrit	????	mother-in-law
3	Sanskrit	श्वश्रू	a mother-in-law
4	Proto-Indo-Aryan	swaśrúH	—
5	Proto-Indo-Iranian	swaćrúH	a mother-in-law
6	Proto-Indo-European	sweḱrúh₂	mother-in-law
7	Proto-Indo-European	swéḱuros	father-in-law

Words derived from “सासू”

સાસુ

Every word from Proto-Indo-European swéḱuros →Every word from Proto-Indo-European sweḱrúh₂ →Every word from Proto-Indo-Iranian swaćrúH →