Hi Ronaldo,
I am from Vancouver and know how tough it is to get started in this area! It is extremely hard to find cash flowing properties and multiplexes are out of the question for regular working families.
My suggestion would be to start with something for your family to live in for a few years and to build equity. Something that allows rentals and is close to transit so when you do have more equity you can pull it out, buy something else and rent your first place out. Grow your portfolio slowly. In my experience the key is to get into the market. You have to buy into a good building though.
Another option for living in is cooperative housing. It is such a great alternative for families! Many people are not familiar with what it is or think it is low income housing but it isn't. It is affordable housing for anyone. In fact now most require you to have a minimum income. It can take quite a while to get into but there are hundreds of co ops in the lower mainland. We lived in one in False Creek. It was a two bedroom condo and our rent was $1000 a month. Another family who lived there moved into a co operative town house complex in Richmond when we were there. They're everywhere. You could have a bigger place for your growing family and buy an investment property.
We are actually considering moving back to a co op and renting out our townhouse because our experience was so good there and it's such an affordable option.
Good luck to you and your soon to be family of 4!