Changing to a family plan

[Djm67]

How do convert 2 plans into a family plan

[kejt_]

Hello @Djm67 and welcome!

When you accept the invite, you're added to Premium for Family when your current billing period runs out. You won't be charged for your account any further - your payments are handled by the plan owner.

However, if your Premium subscription is currently handled by a third party - such as iTunes or your mobile operator - you'll need to contact them to cancel your Premium first.

If you're accepting a Premium for Family invite from the same device it was sent from, please make sure you’re logged in into your account before clicking Accept Invite.

I recommend you to check this article and this 

Let me know if there is anything else you need to know

Have a nice day!