Oh i am sure of RK's character he won't take ay thing that easily even Sultan comes up with concrete proof RK's ego will never accept that sultan is his brother i am not talking about future just analyzing today's episode
I already answered your question , no use calling police on the same charges again , more important rk's mother needs his attention immediately and not sultN . Sultan walked/ sneaked in when Radha fainted when others were busy tending to her . Rk won't leave her and come push sultan out at that moment. For him she comes first