Light wheelchair recommendations

Hi folks,

Dad has a motorised wheelchair (stroke) which is quite heavy. We can take off the motor etc but the chair itself is still heavy enough.

He can walk a bit but not very far and Mam would like to take him out more.

Are there any recommendations for a lightweight chair that someone can sit in comfortably while someone else pushes them?

I'm thinking with these ultralight bikes with carbon frames, surely there's the same for wheelchairs.

Thanks.