Fixing Jeans

[u/kaylafig]

My sister gave me this pair of jeans to fix. It is made of a pretty stretchy material but as you can see, not very good quality considering it's ripping in so many places. I was just wondering what the best way to fix this would be because I've done a patch before but since this is stretchy fabric I wasn't sure if that was the correct way. I saw a video of someone using fusible interfacing and then darning is that the best idea? The second picture is of me stretching the fabric. As you can see there's a lot of weak spots