I think Cathy is still a little concerned about Yasmeen, thanks to Eileen telling her about Yasmeen being locked in the box, but that part of the storyline seemed to have been shelved for now.
I'm also surprised Alya hasn't spoken to Tim about his dad yet. She doesn't need to come straight out with accusations, she just needs to start a conversation about what Geoff was like when he was younger,etc. After all, they're family now so she can just make it look like she's trying to find out about her new step-granddad. Although... I wonder if Geoff has already poisoned his son's mind about her?