So I have a question, I'm wondering why in single player it's harder to kill some of the harder bosses..

Ok, ok I'm answering my own question, but I've done some research, and apparently, the reason why it's easier in multiplayer is bc there's a higher chance for there to be lower lvls, and you can only have your pet by your side. Meanwhile in single players the whole family is nearly the same lvl (unless you play multiplayer a lot) and so it's a lot easier to kill the enemies

Becuse in sigle player you have your family to help and the boss wont go back in fourth as in multi player it's harder becuse boss is going to ALL PLAYERS INSTEAD OF JUST ONE AND YOU HAVE NO FAMILY.