I'm not especially close to my youngest brother, but see him several times a year at family events/occasional meet ups with his family. I have 3 dcs aged 6, 8, 10, he has a son aged 16 months.
My dh is a GP and he has a special interest in paediatrics, with a lot of extra training etc. he is convinced that my brother's ds is on the autistic spectrum. He avoids eye contact, never points, never smiles, never laughs, only very rarely cries (physical injury is the only situation in which we have ever seen him cry).
My brother and his wife have decided not to give the MMR as they are concerned about autism (we have another brother with AS).
If you were in our position with an untested but pretty professional view, would you say? My brother is very very protective of his ds, as is his wife. They have never let anyone babysit overnight, or in fact for more than a couple of hours through the day (never at bedtime).
I really don't want to sound like I am criticising them, but you really can't say anything about their ds to them without it precipitating a major family crisis.
Would you just keep schtum, and let them find out on their own if there is a problem?