My ds has a medical condition which amongst many other things results in him being overweight.
There is a girl in his class who has started to be picked up by his grandmother. The grandmother doesn't speak any English. She has taken a liking to me and ds and tries to chat with me at pick up time. Unfortunately I can't understand anything she says, I'm not sure which language it is 
Now I think but I'm not sure that she is trying to give me advice about ds's weight, because the one word I did pick out is endicronologist.
I find it embarrassing that I don't understand her, I just smile and nod though.
Where it gets tricky now though is that she has taken to talking to ds, and to patting his tummy when she sees him, and ds really hates it.
How can I deal with this without offending her, when we don't speak the same language?