TF, did they also get a financial "gift" to help buy the house?
Of course!
Wedding gift... One from FIL and one from grand-FIL because she got them to commit separately (at least from our perspective and based on stories we've heard), so basically double.
Gift for a house (and she's been talking about a second house).
Two days of childcare from FIL on his days off, even if she's off. Because two kids are too much for one adult to handle.
Who knows what else....
I'm sure she think we're benefitting from living with FIL, but we do pay rent (but family rent, not London rent). But that probably makes us even in her book.