hello......when your family will come here you should try the Aspire Park, near Villaggio....it's very nice, not only for kids....I've been there Saturday for a picnic and I really enjoyed it.... My advice after my few years Doha's experience (also as a European expat) is that you should try all kind of activities, outdoor, as much as you can and when the weather will allow you (in this way you'll avoid just sitting home and do nothing....).
For any other suggestions....just shout here......I'm sure you'll find friends to reply......all the best