Need Help!

I've been replacing my old receptacles in my family room so they are all white after I did some remodeling. I've run into one that has 3-2wire in a single gang-box (black, white and ground). 2 of the cables are 12 gauge and one is 14 gauge! I think the guy who lived here before me hooked this up.

The 14 gauge is coming from a light in a utility closet into the box. The 2-12 gauges are: one is the line and one is the load to other receps on the circuit.

I'm having trouble figuring out how to install the recep. and still have the light work and the rest of the circuit. Any help would be great.

Thanks. MI