What to do about judging family members!

[Guest guest]

I am interested in finding out what all of you say to family members

who think that OCD is a behavioral issue. My sister and brother are

staying with us right now from out of town and I'm hearing a lot of

judgmental type remarks such as " He does just fine when we're around

or when he is doing something he's enjoying but then he shuts down

when you (meaning my husband and I) are around or when he comes homw

after being out with us. " Our son is 16 and has been diagnosed with

mod. to severe OCD for the last 2 years. I've tried to explain that

this is textbook OCD, when they're stimulated or having fun or with

other people they're great kids but they catch up on the OCD symptoms

afterwards but they keep insisting that it's a behavioral problem.

I'm sick of saying the same thing over and over!! Has anybody else

encountered this and, if so, what have you said to quell the doubts

about this being a parenting/behavioral problem. Thanks in advance.