1st time - when Dadi hire Geet as a Maan's secretary (after Maan ask her to leave his KC) and ask her to stay in OH. And Maan trying to get Geet out from OH. Remember that scene when Maan's taking out his anger of women on Geet, and Dadi was listening everything. etc----- Same thing happen Dadi get sick and because of that Maan and Geet get more closer. Most important thing was 1st time Geet realised her feelings about Maan.
2nd time - when Geet start seraching another job and Maan went complaining about that to Dadi, and that time Dadi talking him about his marriage and Maan don't want talk anything about that and he left. after that when she was talking to Geet for leaving this job she get sick again and admitted in the hospital. Result Maaneet get (feck) engaged.
Now this time again both get together because of Dadi. And think this time Maan will be realised her feelings about Geet which he forgot.
Go Dadi Go