Ahana has already started to like Tanuja... When she was cooking for many ppl, when she made rangoli, when they burnt their fingers and laughed about it, when she told rishi that there is a girl with Tanuja's face and he is not marrying her... So there is no doubt that she will supp her.
Beeji loved Tanuja and thinks she is Tanu reborn (Since Shivani days) ... when they were going to hotel she liked tanuja going with Rishi, she loved it when tanuja and Rishi danced together... So she will be jumping with joy to have Tanuja marry Rishi
Dunno about Manpreet and Yuvi .. I think they'll be happy with whatever Rishi is ok with.
Rishi though is very attracted to Tanuja, he's also very confused so I can't guess what he might do.