Yeah, I guess we were brave. We got Jack when Greta was 8 months old. By that time she was 100% reliable with potty training and had free reign of the house while we were gone and we felt like she needed some company. Unfortunately, Jack at 8 months old is NOT reliably potty trained so he still has to be confined to the laundry room while we're gone. So I guess they can visit over the baby gate, but they can't really hang out together yet. They do sleep together at night sometimes in our bedroom though, which is VERY cute!