Purchase single family house vs small appointment complex

[Arta Montero]

Wondering if I can get some advice here. Having a difficult time deciding.

I live in Portland, Oregon. I have two kids, husband and my mom lives with us. We have a 3 bedroom house plus another single family rental.

Given that my mom has one of the bedrooms my girls have to split. My girls are 9 and 5 and would like for them to have their own room since I am thinking we will have no choice on that once they are teenagers.

I have three options:

1. Purchase a 4 bedroom and rent existing house. It would be a good rental. 4 bedroom homes in this area are about $600k.

So, if I purchase a 4 bedroom house will be harder for me to purchase multi family units for awhile since I will not feel comfortable.

2. Modify existing. I am worried that no matter what you do one can mess things up when they modify

Any advice. I feel that by purchasing 4 bedroom I lose flexibility with multi family units