Celtic is split into two branches:
- Continental, including perhaps one dialect of Breton, which would be the only living language in this group.
Insular celtic is further split into:
- Q-Celtic -- Goidelic, including Irish Gaelic, Scots Gaelic and Manx
- P-Celtic -- Brythonic, including British, Welsh, Breton, Cornish and possibly the extinct Pictish language
The differences between P and Q languages are most easily seen in the word for son, mac in Q (hard K sound) and map in P languages. P-languages have a slightly simpler structure and may be younger than the Q-languages.