Planning to buy house in Brookdale/Armadale. Is it good for family with kids? Is it safe area?

A good thing to do might be to add the group "Perth WA Crime Reports" on Facebook and see which suburbs crop up the most. Armadale is definitely one of those.

Stay away from armadale especially if you have kids. Sexual abuse etc is more prevailant for some reason that way amongst other social issues. Not a place to raise kids and the hospital sucks. Its the last hospital I would recommend with an emergency room to go to in almost any situation except perhaps a cut on the head or a broken bone...

Well, I'm building in Brookdale and if everything go well, I shall move in before Christmas.
I guess my say would not weigh much but here's what I would say about the area: you get what you pay for. However, I wouldn't say it's much worse than, say, Kardinya. A friend of mine built a awsome two story at Kardinya and paid a fortune for it. Sadly he had unwanted visitors right after he started moving. Fortunately nothing valuable was stolen. Another friend rents at Murdoch area and before he installed security cameras, his place is broken into at least once a year.
What I'm trying to say is theft is every everywhere and at least Brookdale is quiet.

Yes I agree. There is a lot of trouble and crime around that area, especially beyond the train station and around the recreational center. Maybe try for something a bit norther up, or even a bit more towards the coastline like Coogee or Munster. There's very cheap housing costs around that area.

Although Armadale has had a major makeover in the past few years, it's still pretty yucky around there. Maybe try for somewhere close to their like Piara Waters which is a new housing estate. If the location isn't the reason you want to buy there, maybe try somewhere else similarly positioned from the CBD for similar prices? Rivervale and East Vic Park seem about the same.