The thing is, even if Lucas was shacked up with Rafa's daughter, which I doubt- Rafa would never, ever let some sort of personal connection cloud his judgement. If he was coaching the schoolgirls' under-12s, and Claudia failed to track the midfield runs of her opposite number she'd be benched. And probably dropped for a few weeks for good measure. He'd also regard her with stony silence at the dinner table, talking only to Agata.
We all know this.