My mother in law just sent me a photo of my son dressed in a dress and with his hair tied up for fun. I am quite upset about it but my friends are telling me it's ok. Do you think it is wrong for her to do that?

I think it's fine. I don't think there should be anything offensive about boys dressing up in girl's clothes and vice versa. This not only teaches them to embrace their identity but to appreciate diversity. We should lighten up. Adele thinks it's cool: http://ph.theasianparent.com/adele-let-her-son-dress-up-as-princess-anna-from-frozen/