Conceptually yes, but note that in Linux there is no such thing as a thread. Only processes. Some of those processes happen to share an address space and belong

Conceptually yes, but note that in Linux there is no such thing as a thread. Only processes. Some of those processes happen to share an address space and belong to a thread-group (TGID), but they are all processes. This only really matters when you're trying to understand how PID, PPID, and TGID fit together and why there is no TID, though.