Urge to declutter

I must be starting to feel a bit better...I am starting to get a strong urge to de-clutter our house. There seems to be stuff everywhere (kind of expected in with 3 kids in the house) - and a number of things that are no longer required (exersaucer, high chair, office chair, baby clothes...). There is also the extra motivation that Peter's sister and family are visiting us over Christmas (10 people living in 94sqm for a couple of weeks), so there isn't any room for unnecessary cluttter. Just don't know if I should be.