(adsbygoogle = window.adsbygoogle || []).push({}); If gamesharing is included on the PS4 and you only need 1 account to be on the PS4 with ps+ for every account to be able to play online. Does that mean if you have someones account that has ps+ it will give online to the other accounts?

Yes that's correct, if you have PS+ on one account on you're PS4 it will apply to all the other accounts on the playstation as well.