Need to ensure cultural appropriateness, avoiding stereotypes. Blind characters should be portrayed with depth and agency. The blind father-in-law should not be a victim but someone with a story and personality.
Ending could have a moment where Shanker is seen as a source of wisdom that everyone turns to, despite his blindness, showing that his insight is valuable beyond physical sight.
Possible structure: Three acts. Act 1: Move to husband's home, introduction to Shanker. Initial friction and adjustment. Act 2: Major conflict arises, perhaps a family event where Shanker's blindness creates a problem. Rani and Shanker clash. Act 3: Resolution through understanding and compromise, emotional reunion.
I should also think about the character development arcs. Rani starts off maybe impatient or overwhelmed, grows into someone compassionate and strong. Shanker might start off as a character with a mysterious past that is revealed, adding depth.