Boo to the in laws hun! In my case it's my mother who constantly picks on DS. And tell them hun, average age for walking is now 12-15 months and good on your DD for not getting here teeth yet, the later the better apparently (I know of one child who didn't get her teeth until 17 months). And tell your in laws, you know someone whose DS is 18 months and still not walking all by himself! He will soon I'm sure but I have learned to accept that he will do in his own time