Yep. My family is bigger than the allotment.

Need to be able to add more. Brother, father, mother, kids

little suggestion maybe add family plan for say a small family plan, medium and large not everyone's family size is limited to 6 some families have alot more some alot less

I have five kids, so 7 is needed for immediate family. Google only offers five...

+1!
right now i don‘t need the option. But it can change pretty fast, so…
I wouldn‘t even bother to pay for additional persons.

We are exactly 7 people in my family and 6 of us are on the Family Plan. Why not up the limit to 10 or 25 people with custom domains? And just keep the storage limits where they are right now?

It‘s for me the only reason why I cannot switch to Proton Mail and use another provider instead.
I have 7 user in my custom domain (different generations).

I have a very large family and would be more than willing to pay to add more users to my family plan. There should also be an option to buy more storage as needed since more people = more backups.

This, for me, is currently the primary lack in ProtonMail functionality. I have a Visionary plan and there is nothing I can do to share the domain with other family members, even if I purchased another plan for them (Duo or other)

I voted for this, too. At a minimum, allow me to add an already paying user to the family so that a custom domain can be shared without resorting to using subdomains.

Yes this is much needed for my family of 8 the proton support suggested I could try the buisness plan but that is simply to expensive.

Being able to share a custom domain with a family of more than 6 people make this a critical suggestion.

This is very much needed for my family, which has 9 people. Please add this option. The additional cost could be equal to our current equivalent cost per person. This would reward those who choose to sign up for the 12 and 24 month plans.

With families "online" now easily encompassing 3 generations besides the 6 accounts baseline there should be expansion packages to the family plan. Alternatively a family member should be able to create their own family using the same family custom domain.