I think instead of it being Ronan’s Mum, I think it should’ve been that Ronan had son or daughter who was like 10 years older than Cormac or something and then that would make more sense for Ali to care about Ronan’s Child that he’s taken their Dad away from them.
That’s what I’m thinking, Patti doesn’t look old enough to be Ronan’s Mum at all. It would probably make more sense if it was his daughter who came to look for Ali to find answers on how her Dad died.