Apply Uk visit visa as a family

[Umz]

Dear members am applying my brother’s , his wife and 1 year old daughter visit visa from Pakistan and am filling all the applications on their behalf. As my brother is the main applicant and I filled his application but I can’t find any option to apply as a joint application.
How should I apply for all of them?

Or do I have to fill three seperate applications from three different emails and then book three seperate appointments at vfs?

[CR001]

3 separate forms.