I find it really cute the way Krishna calls Pratigya, 'Pratigya Ji'.
I think it shows that Krishna not only loves her but has a lot of respect for her as he uses the 'Ji' at the end of her name and doesn't just call her Pratigya.
To an extent, it also shows that Krishna is a little different to his father and brother, as he respects Pratigya (his to-be-wife) more than his father respects his mum and his brother respects his babhi.
Krishna is really too cute. π³