How are you getting multiple branches spanning multiple ancestors onto the same Tree?

Question

I keep finding once I'm a couple of branches over from the main/direct branch it stops giving me the option to add more multiple generations on additional branches going back up through the previous generations, and instead I'm prompted to start a new tree 

Click to add relatives of XXX

:

To add XXX;s parents, brothers or sisters, a new family branch can be created

'Create a New Family for 'XXXX'