Apple to the rescue
Not the company, but a literal apple. Four-way PVC connectors are pretty hard to come by, and if you need one of the connectors to be at a certain angle, then your only hope is to contact a manufacturer and beg them to produce one for you at a reasonable price. However, that’s the normal way of doing things, with some engineering skills, you can use a piece of fruit to connect your PVC pipes properly.
Granted, the apple will ultimately deteriorate over time, but purchasing a replacement apple isn’t the worst thing in the world. Plus, this can be a temporary solution until your son or daughter returns from the hardware store with the proper PVC connector.