Instead of upgrading cameras, you're better off investing $40-$90 on a speed light. Your photo quality will increase dramatically for those indoor photos. If you're worried about bulk/weight (and if you're just using it for casual/personal situations like these) you can even get away with a mini speedlite like the Godox TT350. It fits in your pocket, has TTL (auto exposure), wireless trigger capabilities and runs on 2 AA batteries.
Instead of upgrading cameras, you're better off investing $40-$90 on a speed light. Your photo quality will increase dramatically for those indoor photos. If you're worried about bulk/weight (and if you're just using it for casual/personal situations like these) you can even get away with a mini speedlite like the Godox TT350. It fits in your pocket, has TTL (auto exposure), wireless trigger capabilities and runs on 2 AA batteries.