Will Milind quietly accept it and support Saket??
The manner in which Milind's behaving at the moment, he shouldn't be upset or shocked if/when Saket does the same to Sukriti if/when he finds out about her past.
BTW, whyon earth is Milind reacting the way he is...I mean, the 'affair' and the 'baby' happened before Milind came into Prachi's life. So, he shouldn't be upset about what happened before...tho' he should understandably be unhappy that Prachi didn't tell him the truth about her so-called past.
If he truly loves her he ought to accept her with flaws and all and consider Ritwik as his son. Just the way we all expect Saket to do once he finds out the truth.
Instead, Milind's like the proverbial pot calling the kettle black. He's committed adultry himself or so he thinks but has conveniently forgotten all about it!