As far as I am aware there haven't been any failures of the wing suits themselves. The crashes have been due to the misjudging of distances. The wing suit guys are going very fast. They're skimming the side of the mountain trying to get as close as they can. By the time they realize that they have made an error in judgement there isn't enough time to correct their course due to speed.
The article says he's just wearing clothes and no chute. Basically, he's jumping out of a plane and aiming for a net. I'm not saying that when you have kids you have to give up your entire life. However, I do think your priorities have to change and perhaps there are some things that you do have to say goodbye to. Once you make the decision to become a parent your first priority has to be your kids. I believe taking hugely unnecessary risks, like this one, is counter to your responsibilities as a parent. If he wants to keep skydiving, fine. Put a damn chute on.