My advice is test drive all your choices. Bring the whole family during the test drive. If you have yayas and driver, bring them during the test drive. This way you can see if there is enough space for everyone.

I had an Avanza, it will work but will be kind of cramped. With the 3rd row seat up, there is almost no luggage space. Important for school bags, strollers and other stuff you will be hauling. My Avanza was the 1.5 AT and I was doing around 7-8km/l pure city driving.

I upgraded to an Innova and its size is perfect for my needs. 4 adults and 3 kids fit with enough room for stuff. Plus its a diesel and very thrifty with fuel.

A full size van like the starex would be better.