Need a double stroller for Grandma's house

[mac2b]

We're looking for a double stroller for a now 3 mo old and 20 mo old. It will be used maybe once a week. Grandma is little, so we don't want anything too heavy, but she won't be opening/closing it...I just don't know how these are to push around once you get 2 kids in there - we don't have one yet for us either.

So...any suggestions?

Thanks!