well , this is quite likly as i have also been writing about this since the promo ( richa maang bardo)
has been released . it could be a conversation which might be about her elder child whcih she might ask richa and this might bring in doubts in kunal mind and then may be he tries to find things out etc.
parent trap may be used to unite the parents while the investgation keeps goning on from kiunal ' s side .
wrt the temple shot he might on hearing the sidhi richa convo , about the first kid would get his doubts about richa's evil doings added with her taking advantage of hi s current plight etc may just snub her and walk away.
kids maybe used to keep their parents safe from other evils at their respective places !