I would keep very quiet about it until I had time to get my head around it, but would definitely give a lot to my sons and help my mum as soon as I had done that, or instantly if the need arose.
That said, people might quickly suspect something because I would definitely go on an instant spending spree to replace our currently broken-down old car, broken vac, broken lawn mower and half-broken sofas, get the cooker repaired, do something about the 'dodgy' new fridge-freezer and equally dodgy replacement new washing machine (its predecessor was part of the pre-Christmas safety recall), and get a potentially very expensive intermittent problem with our crackly landline fixed. To name but a few!