Oh, that is away, scooby. Does he have anyone elsehe'll be writing to, with whom you can swap stories about him, just so you all don't miss him so much?
determined, with regard to scheduling the time for yourself, what about something like mum and baby yoga? It strengthen's the body's core muscles (so defensible on health grounds), yoga is meant to lower blood pressure ('nuff said), and babies are involved, too. I'm doing a class on Thursdays, and DD laughs at all the windmilling arms and ladies standing on one leg! I have also bought a DVD to do with DS - more bonding there (and Darcie has got to be more co-ordinated than my poor DS, who takes after me!). Your chilled day is all vry well, but it's the only such day we've heard of so far! 
northern, how's the sick chinchilla? Is it able to spend any time outside enjoying the weather?
rice, that is a shame about the half-Dutch family. Some people do get funny about that kind of thing. I had a friend whose father was Hungarian (got out in '56) and never really taught his children the language, possible because of the trauma of leaving, and not wanting them to experience the same homesickness (?); however, that absolutely does not apply to a Dutch person!
Could she make contact with someone in her ILs' home town (a lot of Dutch do speak brilliant English - TV is subtitled rather than dubbed) who could help her make contact with the ILs, e.g. speaking through skype to the child? One last thing which might be inhibiting him is the idea that Dutch is not one of the "grand" European languages (e.g. French, German, Spanish, English): that, too, is insufficient excuse because, as Northern points out, it does develop the brain. Apparently, the knowledge that there is more than one word for something is the first door to abstract thought in a child! My DC aren't even going to be properly bilingual, as their "mother tongue" is the one spoken all around them, so there will always be an imbalance between the two languages. Still, DS is really improving a lot at the moment, and it makes me really warm to hear him speaking with his father and grandparents in their language.
He hates me speaking it, though.